140 is the same as multiplying by 319 as an equation can be written as 140 = a x 319.
What is an equation?An equation is a mathematical expression that contains an equal symbol. Equations often contain algebra. Algebra is used in mathematics when you do not know the exact number in a calculation.
Hence, the sentence as an equation for 140 is the same as multiplying by 319 is, 140 = a x 319.
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To express the given numbers in equation form it can be written as =
140 is the same as multiplying by 319 as an equation can be written as 140 = a x 319.
What is an equation?
An equation is a mathematical expression that contains an equal symbol. Equations often contain algebra. Algebra is used in mathematics when you do not know the exact number in a calculation.Hence, the sentence as an equation for 140 is the same as multiplying by 319 is, 140 = a x 319.A mathematical statement known as an equation is made up of two expressions joined together by the equal sign. A formula would be 3x - 5 = 16, for instance. When this equation is solved, we discover that the value of the variable x is 7.To know more about equations check out,
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A credit card company determines a card holder's minimum monthly payment by adding all new interest to 1.5% of the outstanding principal. The credit card company charges an interest rate of % per day. On November , a customer used his credit card to pay for the following business expenses: van repairs ($), equipment maintenance ($), office supplies ($), and dinner with clients ($). Use the given information and the rule that minimum payments are rounded up to the nearest dollar to answer parts a and b below.
a. Assuming the card holder had no new interest, determine his minimum payment due on December 1, his billing date.
The card holder's minimum payment due on December 1 is ___$.
(a) Minimum payment to be paid is $22
(b) Minimum payment to be paid is $35
What is Simple Interest?Simple interest is a quick and simple formula for figuring out how much interest will be charged on a loan.The daily interest rate, the principle, and the number of days between payments are multiplied to calculate simple interest. Although some mortgages employ this calculation approach, this kind of interest typically relates to auto loans or short-term loans.
The formula for simple interest is:
Simple Interest=P×R×T
where:
P=Principal Amount
R=Daily interest rate
T=Number of days between payments
(a)The minimum monthly payment is calculated by taking 1.5 percent of the outstanding principle
(0.015) ×$ (677+452+139+141) = $21.135
as there is no additional interest due.
The minimum monthly payment required on December 1 is $22, rounded up to the nearest whole dollar.
(b) The minimum monthly payment will be equal to 1.5 percent of the outstanding principle plus the new interest charges.
We will apply the simple interest formula, S.I = p×r×t, to get his new interest costs.
Because Dec contains 31 days, the
Principle amount, p = (677+452+139+141) - 300 = 1109,
the rate, r = 0.05163% each day
Time, t = 31 days.
S.I =p×r×t=1109×0.0005163×31= $17.75
0.015×1109 = 16.64, which is 1.5 percent of the outstanding amount.
To reach $17.75 + $16.64 = $34.39, we must now add the additional interest to 1.5 percent of the outstanding principal.
The minimum monthly payment required on January 1 is $35, rounded up to the next whole dollar.
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Solve 8x - 2y = 0 and -6x + 14y = 50 using elimination. Show steps. Put your answer in coordinate form (x,y)
The required solution (1, 4) of a linear system of the equation is determined by the elimination method.
Given the linear system of equations:
8x - 2y = 0 or 4x - y = 0 …(i)
-6x + 14y = 50 or -3x + 7y = 25 …(ii)
Equations (i) and (ii) constitute a system of two first-degree equations in the two variables x and y.
So, we have to find out the value of 'x’ and 'y’.
By multiplying 7 by equation (i) and adding both equations
28x - 7y -3x + 7y = 25
25x = 25
x = 25/25
x = 1
Substitute the value of x = 1 in the equation (i), and solve for y
4(1) - y = 0
y = 4
Hence, the required solutions are x = 1 and y = 4.
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Music Company A charges a 15$ membership fee and 0.75$ each to download a song. Music Company B charges 0.90$ each to download a song with no membership fee.
a. For what number of songs will both companies charge the same amount? Justify your answer using mathematics.
_________ Songs
You anticipate that you will download 150 songs. Which company should you choose if you want to spend the least amount of money? Justify your answer using mathematics.
________ (Type Company A or Company B)
a. Using linear equations in one variable we get the number of songs at which both companies would charge the same amount is 100 songs.
b. Company B would be a better choice as the total charges for 150 songs would be $127.5.
Explain linear equations in one variable.
A straight line with only one variable is a linear equation. the single variable's power is 1. Simple algebraic methods are used to solve these equations, which have the form ax+b=0.
a) Assume the number of songs downloaded is 'x'.
Now according to the question,
Total charges by company A is 15+0.75x
Total charges by company B is 0.90x
For equal charges, both must be equal,
Hence equating the 2 expressions we get,
15+0.75x=0.90x
15=0.15x
x=100
Hence total number of songs to reach the charge of the same amount is 100.
b)Let us take 150 songs from company A, we get the total charge to be
15+0.75*150=$127.5
Taking for company B, we get
0.90*150=$135.
We see that for 150 songs, the charges of company A is less compared to company B. Therefore I would choose company B over company A.
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Find the cost of installing a fence around all sides of a rectangular
yard that is 50 feet by 90 feet. The fence that is being used costs
$8.50 per foot.
$1,190.00
$2,380.00
$3,825.00
$38,250.00
The total cost of installing a fence around all sides of the rectangular yard would be $38250.
What is the area of the rectangle?
For the dimensions of the rectangle of length 'l' and breadth 'b', the area can be computed by using the formula,
Area = Length × Breadth
Given data:
The length of the yard is 90 feet. and the breadth is 50 feet.
Area of the yard = length * breadth
= 90 * 50
= 4500 square foot
Now per square foot, the cost is $8.50 so the total cost of installing a fence around all sides of the yard would be = 4500 * 8.5
= $38250.
Hence, the total cost of installing a fence around all sides of the rectangular yard would be $38250.
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Inequalities in the real world
Pls help
Let f(x)= -4x-1 and g(x)= x^2 +3. Find (f o g)(-6).
The value of (f o g)(-6) will be;
⇒ (f o g)(- 6) = - 157
What is an expression?
Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
The values are,
⇒ f (x) = - 4x - 1
And, g (x) = x² + 3
Now,
Since, The values are,
⇒ f (x) = - 4x - 1
And, g (x) = x² + 3
Hence, The value of function (f o g)(x) is,
⇒ (f o g)(x) = f (g (x) )
= f (x² + 3)
= - 4 (x² + 3) - 1
= - 4x² - 12 - 1
= - 4x² - 13
Thus, (f o g)(- 6) = - 4 (-6)² - 13
= - 4 × 36 - 13
= - 144 - 13
= - 157
So, The value of (f o g)(-6) will be;
⇒ (f o g)(- 6) = - 157
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what is the equation of the line that passes through the point (3, -4) and had an undefined slope
The equation of the line that passes through the point (3,4) and has an undefined slope is y = 3
What is an Undefined Slope?An undefined slope is an infinite slope. This is the slope of a vertical line. The x values never changes no matter the changes in the y values.
The equation of a line in slope intercept form can be represented as follows:
y = mx + c
where
m = slope
c = y-intercept
Since the slope, m is undefined, the expression that has an undefined slope is a vertical line
Therefore,
y = 3
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The same digits are used for the expressions 7² and 2⁷ . Explain how to compare the value of each expression.
Choose the correct answer below.
A. Write each power as repeated multiplication. These compare the bases of the exponents.
B. Write each power as repeated multiplication. Then compare the number of factors.
C. Write each power as repeated multiplication. Then evaluate and compare their values.
Write each power as repeated multiplication. Then evaluate and compare their values is the correct option to compare the value of each expression.
What is the relation between power and base?
In mathematics, a base number raised to an exponent is referred to as a power. The base number is the factor that is multiplied by itself, and the exponent indicates how many times the base number has been multiplied.Compare 7² and 2⁷.
7 ≠ 2
So, write the power as repeated multiplication of the given expression:
7² = 7 * 7
2⁷ = 2*2*2*2*2*2*2
Evaluate:
7² = 49
2⁷ = 128
Compare the values:
128 > 49
2⁷ > 7²
Hence, Write each power as repeated multiplication. Then evaluate and compare their values is the correct option to compare the value of each expression.
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In a busy airport, aeroplanes from EZPlanes Airways depart every 264 minutes
whilst aeroplanes from Bryanair Airlines depart every 198 minutes. If both airlines
have aeroplanes departing at 06:20 when is the next time they will depart from
the airport together again?
The next time they will meet again is 08:44 (next day)
How to determine the next time they will meet againFrom the question, we have the following parameters that can be used in our computation:
EZPlanes Airways depart = every 264 minutes
Bryanair Airlines depart = every 198 minutes
Both airlines depart = at 06:20
Using the above as a guide, we have the following departure times
EZPlanes Airways depart = 264, 528, 792, 1056, 1320, 1584, 1848, 2112, 2376 and 2640 minutes,
Bryanair Airlines depart = 198, 396, 594, 792, 990, 1188, 1386, 1584, 1782 and 1980 minutes
The common departure time in the above is
Time = 1584 minute
So, we have
Common departure time = 06:20 + 1584 minutes
Evaluate the sum
Common departure time = 06:20 + 26 hours + 24 minutes
Evaluate the sum
Common departure time = 08:44 (next day)
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find the mean weight and variance of the following students in kilograms 50,70,58,62,66,53 and 76
Answer:
The answer is 62 and 86
Step-by-step explanation:
Mean
(50 + 70 + 58 + 62 + 66 + 53 + 76) ÷ 7
435/7 = 62.1 ≈ 62
Variance
(50 - 62)² + (70 - 62)² + (58 - 62)² + (62 - 62)² + (66 - 62)² + (53 - 62)² + (76 - 62)²
(144 + 64 + 16 + 0 + 16 + 81 + 196)/(7 - 1)
517/6 = 86
Thus, The mean of the given data is 62 and Variance is 86
The area of the triangle formed by the x and y intercepts of the parabola y=0.5(x-3)(x+k) is 1.5 find all possible values of k
Answer:
The possible values of k are -0.56, -3.56, -2 and -1.
Step-by-step explanation:
We have the equation of the parabola, .
Substituting x=0, we get that i.e. y = -1.5k
So, the y-intercept is (0,-1.5k).
Thus, the height of the triangle becomes |-1.5k| = 1.5k
Again, substituting y=0, i.e. i.e. x=3 and x=-k
So, the x-intercepts are (3,0) and (-k,0).
Thus, the base of the triangle is 3+k if k>-3 or -3-k if k<-3.
We see that 'k' cannot be 0 or -3 as if k=0, then height = 0, which is not possible. If k= -3, then the base = 0, which is also not possible.
As, area of a triangle = .
Substituting the values, we get,
1.5=
i.e.
i.e. k = -0.56 and k = -3.56
or
1.5=
i.e.
i.e. k = -2 and k = -1.
Thus, the possible values of k are -0.56, -3.56, -2 and -1.
18. Find the total length of segment A E.
Using Pythagorean Theorrem the length of AE = 46 units
What is a Right Angle Triangle?
A right triangle or right-angled triangle, or more technically an orthogonal triangle, formerly known as a rectangled triangle, is a triangle with one right angle, i.e. two perpendicular sides. Trigonometry is founded on the relationship between the sides and other angles of a right triangle.
Solution:
In Triangle ABC using Pythagorean Theorem
AC = √(21*21 + 20*20)
AC = √841
AC = 29
In Triangle CDE using Pythagorean Theorem
CE = √(8*8 + 15*15)
CE = √289
CE = 17
From the figure we can say that AE = AC + CE
AE = 29 + 17
AE = 46 units
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Please help
Find the angles:
Arc QR =
Arc RS =
QPS =
PSR =
SRQ =
The angles of the cyclic quadrilateral and the arc angle is as follows:
arc QR = 48°arc RS = 96°∠QPS = 72°∠PSR = 87°∠SRQ = 108°How to find the angles in a cyclic quadrilateral?A cyclic quadrilateral is a quadrilateral drawn inside a circle. In other words, a cyclic quadrilateral is a quadrilateral which has all its four vertices lying on a circle.
A cyclic Quadrilateral's opposite angles add to 180°.
Therefore,
∠PSR = 180 - 93 = 87 degrees.
An inscribed angle is one-half of the measure of the arc that it intercepts.
Therefore,
87 = 1 / 2 arc PQR
cross multiply
arc PQR = 87 × 2
arc PQR = 174 degrees
Hence,
arc QR = 174 - 126
arc QR = 48 degrees
arc RS = 360 - 90 - 174
arc RS = 96 degrees.
∠QPS = 1 / 2 (96 + 48)
∠QPS = 1 / 2 (144)
∠QPS = 144 / 2
∠QPS = 72 degrees
∠SRQ = 180 - 72
∠SRQ = 108 degrees
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Answer:
48°
96°
72°
87°
108°
Step-by-step explanation:
arc QR = 48°
arc RS = 96°
∠QPS = 72°
∠PSR = 87°
∠SRQ = 108°
Find the angle between 0 and 2π in radians that is coterminal with the angle -25π/6
Hi,
I hope you and your family are doing well!
An angle is coterminal with another angle if it has the same terminal side as the other angle, but may have a different degree measure. In other words, coterminal angles are angles that are measured around the same point on the unit circle, but may start at different points.
To find the angle between 0 and 2π in radians that is coterminal with the angle -25π/6, we can add or subtract multiples of 2π to -25π/6 until we get an angle between 0 and 2π.
For example, adding 2π to -25π/6 gives us:
-25π/6 + 2π = -π/6 + 2π = 7π/6
This angle is between 0 and 2π, so it is coterminal with -25π/6.
Alternatively, subtracting 4π from -25π/6 gives us:
-25π/6 - 4π = -29π/6 = -π/2
This angle is also between 0 and 2π, so it is coterminal with -25π/6.
Therefore, the angle between 0 and 2π in radians that is coterminal with -25π/6 is either 7π/6 or -π/2.
Please give this answer 5 stars and brainliest if you find it helpful.
Happy Holidays & New Year!
Simplify each expression. Then drag and drop the equivalent matching expression.
3a+b+13a
20b+11a-5b
20b-5b+2b
You will not use all of the expressions.
The equivalent expressions are 16a + b, 17b + 11a, and 17b.
What are Equivalent expressions:A mathematical expression made up of variables, coefficients, constants, and operations like addition, subtraction, multiplication, and division is called an algebraic expression.
In general, if anything is considered equal then the two of them are said to be equivalent. Similarly to this, if any two or more algebraic equations have identical solutions or roots then the equations are Equivalent expressions even they look different.
Here we have
Expressions
3a +b +13a
20b +11a -3b
20b -5b +2b
To simplify given expressions add or subtract like terms as given below
3a +b +13a => (3a+13a) +b = 16a + b
Therefore,
The equivalent expression of 3a +b +13a is 16a + b
20b +11a -3b => (20b-3b) + 11a = 17b + 11a
Therefore
The equivalent expression of 20b +11a -3b is 17b + 11a
20b-5b+2b => 20b+2b - 5b = 22b -5b = 17b
Therefore,
The equivalent expression of 20b-5b+2b is 17b
Therefore,
The equivalent expressions are 16a + b, 17b + 11a, and 17b.
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Which is equivalent to 64 1/4 ?
O24^4
04
O 16
O 1644
Help me pls !! Being timed !
The value equivalent to [tex](64)^{1/4}[/tex] is [tex]2\sqrt[4]{4}[/tex].
What is meant by an expression?An expression or mathematical expression is a finite arrangement of symbols that are well-formed in line with context-dependent criteria. To help define the logical grammar and order of operations, mathematical symbols can be used to represent variables, operations, functions, brackets, punctuation, and grouping.
A formula and an expression are often distinguished by authors, with the former designating a mathematical entity and the latter a statement about such a thing.
But in contemporary mathematics, and particularly in computer algebra, formulas are seen as expressions that can be evaluated as true or false, depending on the values given to the variables present in the expressions.
Given expression is [tex](64)^{1/4}[/tex]
The number 64 can be written as 2 × 2 × 2 × 2 × 2× 2 =2⁶
So, the above given expression becomes,
[tex](64)^{1/4}[/tex]=[tex](2^{6}) ^{1/4}[/tex]
2⁶=2⁴.2²
So,
[tex](2^{6}) ^{1/4}[/tex]=[tex](2^{4} 2^{2})^{1/4}[/tex]
By simplifying we get,
[tex](64)^{1/4}[/tex]=[tex]2\sqrt[4]{4}[/tex]
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Todd orders pictures from a photographer. Each picture costs $7.50 A one time shipping fee of
$3.25 is added to the cost of the order.
Write an algebraic expression that reflects this situation.
Answer:
1.25 es la respuesta
Step-by-step explanation:
Answer:
Step-by-step explanation:
Given:
Each picture costs $7.50
One time shipping cost = $3.25
Total cost of the order = $85.75
To FInd:
An equation to determine the number of pictures ordered.
Solution:
Define x:
Let x be the number of pictures bought.
Let y be the total amount of money collected.
Form the equation:
The $3.25 one time shipping cost is a fixed cost.
The $7.50 is a variable cost depending on the number of pictures ordered.
Therefore the equation:
⇒ y = 3.25 + 7.5x
Find the number of pictures bought.
The total cost is $85.75
3.25 + 7.5x = 85.75
7.5x = 82.50
x = 11
Answer: The equation is y = 3.25 + 7.5x and Todd bought 11 pictures.
WHat is 64% as a fraction
Answer:
64/100
Step-by-step explanation:
Answer: 16/25or64/100
Step-by-step explanation: 64/100 and divide it by 4 . To change a percent to a fraction, put the percentage over 100 (after removing the % sign) and simplify if necessary
Using rectangles whose height is given by the value of the function at the midpoint of the rectangle's base, estimate the
area under the graph using first two and then four rectangles.
f(x) = x³ between x = 2 and x = 4
The area under the graph using first two and then four rectangles f(x) = x³ between x = 2 and x = 4 is 0.2421875.
Here a=0, b=1 and n=2( two rectangles), so
Δx = (1 - 0)/2
Δx = 1/2
Δx = 0.5
M2 = (0.5) * ( f((0+0.5)/2)) + f((0.5+1)/2)) )
= (0.5) * ( f(0.25) + f(0.75) )
Using f(x) = x^3
=(0.5) * ( 0.015625 + 0.421875 )
=0.21875
Here a=0, b=1 and n=4( four rectangles), so
Δx = (1 - 0)/4
Δx = 1/4
Δx = 0.25
M4 = (0.25) * ( f((0+0.25)/2)) + f((0.25+0.5)/2)) + f((0.5+0.75)/2)) + f((0.75+1)/2)) )
=(0.25) * ( f(0.125) + f(0.375) + f(0.625) + f(0.875) )
Using f(x) = x^3
= (0.25) * ( 0.001953125 + 0.052734375 + 0.244140625 + 0.669921875 )
= 0.2421875
Hence, the area under the graph using first two and then four rectangles f(x) = x³ between x = 2 and x = 4 is 0.2421875.
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5/6 q - 1/3 q = 2/5
Please explain step by step on how I could get this answer
Answer:
4/5
Step-by-step explanation:
5/6q-1/3q=2/5
We change the coefficient’s denominators to 6 so we can subtract them
5/6q-2/6q=2/5
3/6q=2/5
1/2q=2/5
Now divide both sides by 1/2 or multiply both sides by 2
1/2q=2/5
/1/2. /1/2
q=2/5/1/2
q=2/5*2/1
q=4/5
Hopes this helps please mark brainliest
PLEASE HELP!!!!!!!!!
Two people receive an e-mail. Every day, the number of people who receives the e-mail triples. If people continue to receive the e-mail at this rate, how long will it take until 4,374 people receive the e-mail?
Choose the equation for the number of people who receive the e-mail, E, in terms of the number of days since the first e-mail was sent, d, and the correct solution.
PLS HELP
Answer:
Step-by-step explanation:
First, you will multiply 2 times 4,374 and get 8,748 then you will divide 8748 by 7 which is a week, and get 1249.7 then you will divide it by 356 which is a year approximate, and get 10.51 days.
graph and label (-3.25,3)
Answer
hello I have provided a picture of the answer
Step-by-step explanation:
ur welcome and have a nice day
Use the distance formula to find the distance between the points (−1,6) and (−1,7).
The required distance between the points (−1,6) and (−1,7). is 1 unit.
Given that,
using the distance formula to evaluate the distance between the points (−1,6) and (−1,7).
Distance is defined as the object traveling at a particular speed in time from one point to another.
Here,
The distance formula is given as,
D = √[[x₂ - x₁]² + [y₂+ - y₁]²]
Substitute the values in the above equation,
D = √[[-1 + 1]² + [7 - 6]²]
D = √[0 + 1]
D = 1
Thus, the required distance between the points (−1,6) and (−1,7). is 1 unit.
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PLS HELPPPPPPPPPPPPPPP
Answer:
1: 50
2: 1
3: 2
4: 36
5: 0
6: -12
7: -2
8: 3
Step-by-step explanation: Use PEMDAS
P: Parentheses
E: Exponents
M: Multiplication
D: Division
A: Addition
S: Subtraction
Which sequence of transformations could demonstrate the similarity of the two shapes from Part 1?
A. a rotation and then a reflection
B. a dilation and then a reflection
C. a rotation and then a dilation
D. a translation and then a reflection
Ima needs an at least B help me out here Please.
What number makes the expressions equivalent?
−1.1−1.4m + 0.4 = ? − 1.4m
By using the concept of algebraic expression, it can be calculated that
The number that makes the expressions equivalent is -0.7
What is algebraic expression?
Algebraic expression consist of variables and numbers connected with addition, subtraction, multiplication and division.
The given algebraic expression is
−1.1−1.4m + 0.4
On simplifying −1.1−1.4m + 0.4
−1.1−1.4m + 0.4
-0.7 - 1.4m
So the number that makes the expressions equivalent is -0.7
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3y^2 + 3(4y^2 - 2) please help
The roots of the quadratic equation 3y² + 3(4y² - 2) is ± √(1/7).
What is a quadratic equaton?A quadratic equation is an algebraic expression in the form of variables and constants.
A quadratic equation has two roots as its degree is two.
Given, 3y² + 3(4y² - 2).
3y² + 12y² - 2.
14y² - 2.
Let 14y² - 2 = 0.
14y² = 2.
y² = (2/14).
y = ± √(2/14) Or ± √(2/2×7) Or ± √(1/7).
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Use the formula A=P(1+r/n)ⁿt to solve the compound interest problem
Find how long it takes for $ 900 to double if it is invested at 6 % interest compounded monthly.
The money will double in value in approximately years.
In 11.61 years the given principal amount of $ 900 will be double.
What is Compound interest:Compound interest is interest charged on a loan and is determined by both the principal amount and the rate of interest compounding per year.
The formula for the Amount when compound interest is calculated is given by
Amount, A = P(1+r/n)^ntP = Principal amount
r = Rate of interest
n = Number of compounds
t = Time period in years
Here from the given data,
Principal amount = $ 900
Rate of interest = 6% = 6/100 = 0.06
Number of compounds = 12 [ ∵ compounded monthly]
Here we need to find the time period
Assume that after 't' years the amount will be doubled
From the given data and formula,
Amount, A = 900(1+0.06/12)^12t
= 900(1+0.06/12)^12t
= 900(1 + 0.005)^12t
= 900 (1.005)^12t
As we assumed after 't' years the amount is double
=> 900 (1.005)^12t = 2 × 900
=> (1.005)^12t = 2
Applying log on both sides
=> log (1.005)^12t = log 2
=> 12t log(1.005) = log 2
=> 12t = log 2/log(1.005)
[ we can use a calculator for log (1.005) and log 2]
=> 12t = 0.30108/ 0.00216
=> 12t = 139.888
=> t = 11.61
Therefore,
In 11.61 years the given principal amount of $ 900 will be double.
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Let the following sample of 8 observations be drawn from a normal population with unknown mean and standard deviation: 25, 11, 12, 27,26, 22, 8,5. Use Table 2. a. Calculate the sample mean and the sample standard deviation. (Round intermediate calculations to 4 decimal places. Round "Sample mean" to 3 decimal places and "Sample standard deviation" to 2 decimal places.) Sample mean 17.000Sample standard deviation 79.42 b. Construct the 95% confidence interval for the population mean (Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval 83.41 to -49.418 c. Construct the 90% confidence interval for the population mean. (Round "t" value to 3 decimal places and final answers to 2 decimal places.)Confidence interval 70.21 to -36.218 d, what happens to the margin of error as the confidence level increases from 95% to 90%?as the confidence level increases, the margin of error becomes smaller
For the given data
(a) sample mean is 17 and sample standard deviation = 8.91 .
(b) the 95% confidence interval is (9.551 , 24.449) .
(c) the 90% confidence interval is (11.032 , 22.968) . .
In the question ,
the data is given as 25, 11, 12, 27,26, 22, 8,5.
So , the number of terms (n) = 8
Part(a)
the sample mean(μ) is = (25+11+12+27+26+22+8+5)/8 = 17
the standard deviation is calculated as :
= √[(25 - 17)² + (11 - 17)² + (12 - 17)² + (27 - 17)² + (26 - 17)² + (22 - 17)² + (8 - 17)² + (5 - 17)²)]/7
Simplifying the above data further ,
we get
= 8.91
Part(b)
we know that at 95% confidence interval , the critical value is t₀.₀₂₅,₇ = 2.3646
So , the 95% confidence interval is :
= μ ± t₀.₀₂₅,₇*s/√n
= 17 ± 2.3646*8.91/√8
= 17 ± 7.449
So , the interval is ⇒ (9.551 , 24.449) .
Part(c)
we know that at 90% confidence interval , the critical value is t₀.₀₅,₇=1.8946
So , the 90% confidence interval is :
= μ ± t₀.₂₅,₇*s/√n
= 17 ± 1.8946*8.91/√8
= 17 ± 5.968
So , the interval is ⇒ (11.032 , 22.968) .
Therefore ,(a) the sample mean and standard deviation are 17 and 8.91
(b) the 95% interval is (9.551 , 24.449) .
(c) the 90% interval is (11.032 , 22.968) .
The given question is incomplete , the complete question is
Let the following sample of 8 observations be drawn from a normal population with unknown mean and standard deviation: 25, 11, 12, 27,26, 22, 8,5.
(a) Calculate the sample mean and the sample standard deviation.
(b) Construct the 95% confidence interval for the population mean.
(c) Construct the 90% confidence interval for the population mean.
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