The table below shows the probability distribution of students in a high school with 1500 students. What is the expected value for the age of a randomly chosen student?
Age
13, 14, 15, 16, 18
Probability
0.01, 0.28, 0.30, 0.25,0.15,0.01
A. 15.28
B. 15.64
C. 15.34
D. 15.36
Answers
Answer: 15.28
Step-by-step explanation:
The expected value for the age of a randomly chosen student is,
⇒ 15.28
Given that:
Total number of students,
⇒ n = 1500,
And, Age : 13, 14, 15, 16, 17, 18
Probability : 0.01, 0.25, 0.27, 0.30, 0.16, 0.01
Now,
We can Calculate the expected value as shown below,
E = 13 × 0.01 + 14 × 0.25 + 15 × 0.27 + 16 × 0.30 + 17 × 0.16 + 18 × 0.01
E = 0.13 + 3.5 + 4.05 + 4.8 + 2. 72 + 0.18
E = 15.38
Therefore, The expected value for the age of a randomly chosen student is 15.38.
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Related Questions
An objects _________
Answers
Please help!! Will mark brainilest ☺️
Answers
Answer:
B
Step-by-step explanation:
Because there's no change in x so it has to be a straight line going through the y-axis.
Also for A and C, they don't even touch y = 2 so you can easily cross those out.
5
What is the missing value in the following arithmetic sequence?
4
3
9.2
2
1
5.6
n
3.8
2
an
7.1
7.2
74
7.5
Answers
Answer:
C-7.4
Step-by-step explanation:
just took the test EDG2020
The nth term of an arithmetic sequence is a +(n-1)d. The missing term of the arithmetic sequence is 7.4
How to calculate the nth term of an arithmetic sequence?The nth term of an arithmetic sequence is expressed according to the formula as shown:
Tn = a + (n -1)d
where:
a is the first term = 2
d is the common difference = 3.8 -2 = 1.8
Required
Fourth term (n = 4)
Substitute
T4 = 2 + (4 -1)(1.8)
T4 = 2+3(1.8)
T4 = 7.4
Hence the missing term of the arithmetic sequence is 7.4
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PLEASE HELP WILL MARK BRAINLEIST
Answers
Answer:
a
Step-by-step explanation:
Answer:
a
Step-by-step explanation:
what's the answer please
Answers
Gas prices are expected to rise 5% each week for the next six weeks. Kevin spent $52.50 to fill his tank this week.
Which of the following represents the total amount Kevin can expect to spend to fill his tank over the next three
weeks, if he fills his tank once a week?
$52.50 + $55.13 + $57.76
$52.50 - $55.13 + $57.88
$55.13 + $57.76 - $60.39
$55.13 - $57.88 + $60.78
Answers
Answer:
D. $55.13 - $57.88 + $60.78
Step-by-step explanation:
52.50 x 1.05= 55.125 = 55.13
55.13 x 1.05= 57.88125 = 57.88
You can already eliminate a, b, and c because they don't match, so the answer is D.
The total amount is 55.13+57.88+60.78. Therefore, option D is the correct answer.
Given that, gas prices are expected to rise 5% each week for the next six weeks. Kevin spent $52.50 to fill his tank this week.
What is the percentage?In mathematics, a percentage is a number or ratio expressed as a fraction of 100.
Now, in the first week 105% of 52.50
52.50 x 1.05= 55.125 = 55.13
In the second week 105% of 55.13
55.13 x 1.05= 57.88125 = 57.88
In the third week 105% of 57.88
57.88x 1.05= 60.775=60.78
So the total amount=55.13+57.88+60.78
Therefore, option D is the correct answer.
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answer fast.... ........
Answers
Answer:
A.) 1/2
B.)5/8
C.)1/4
D.)3/4
To find the fraction just count the number of figures total. This is the denominator of your fraction
NExt just count how many spaces are shaded and that number is your numerator
For example in A we see that there is 4 triangles total
Therefore our fraction currently is x/4
NeXT we see that there are 2 shaded in
This makes our fraction 2/4 which if simplified is 1/2
Step-by-step explanation:
The average cost for a gallon of gasoline in 2006 was $2.45. In 2007, the average cost of a gallon of gasoline was $3.29. What is the
approximate percent of change in the cost of a gallon of gasoline?
Answers
Answer:
34%
Step-by-step explanation:
100%=2.45
? =3.29
3.29/2.45×100=134.29
134.29-100=34%
FLUENCY
• If the point A(2,7) was dilated by a factor of 2 with a center at the origin and then translated
by three units left and four units down, its image would be located at which of the following?
A: (1,10)
B:(1,5)
C:(7, 18)
D:(10, 3)
Pleaseee help!!
Answers
Answer:
Answer option A: (1, 10)
Step-by-step explanation:
With the dilation by a factor of "2" via the origin, the point A goes from:
(2, 7) --> (4, 14)
Then with a shift of three units left it goes:
(4, 14) --> (4 - 3, 14) = ( 1, 14)
Then when shifting it four units down, it goes:
(1, 14) --> (1, 14 - 4) = ( 1, 10)
Is there another way to extend the plane of complex numbers other than by the Riemann sphere?
No answer needed! Just take the points.
Answers
Step-by-step explanation:
Put the question again I don't see it
Solve the radical equation.
PLEASE HELPPPP
Answers
(The answer is in the bottom of the picture)
I need help with problem 8 with work shown and explanation
ASAP PLEASE!!!!!!!!
Answers
Answer:
6 movies = 1st plan
7 movies = 1st plan
8 movies = Either is fine. (They're the same price)
9 movies = 2nd plan
10 movies = 2nd plan
Step-by-step explanation:
6 movies (1st plan) = 20 + 5 × 6
= 50 (less than 60 so it is cheaper)
7 movies (1st plan) = 20 + 5 × 7
= 55 (less than 60 so it is cheaper)
8 movies (1st plan) = 20 + 5 × 8
= 60 (same as 2nd plan so either is fine)
9 movies (1st plan) = 20 + 5 × 9
= 65 (more than 60 so 2nd plan is better)
10 movies (1st plan) = 20 + 5 × 10
= 70 (more than 60 so 2nd plan is better)
True or false are all structures made by humans and why
Answers
Answer:
mostly. trees and most plants arent
Lin is paid $90 for 5 hours of work. She used the table to calculate how much she would be paid at this rate for 8 hours of work 1. What is the meaning of the 18 that appears in the table?.
Answers
Answer:
It was used as the multiplier because the 5 represents the hours she's worked. If she uses the 1/5 graph she will find the unit rate of each time she gets paid an hour.
Simplify (W^4)^4 without parentheses
Answers
Answer:
w^16
Step-by-step explanation:
you have to multiply the exponents when this happens so 4*4=16
Find the x-intercept of the following linear function: 3x - 2y- 16
QUICK
Answers
I gotchu
To solve for x-intercepts, y must be 0.
3x - 2(0) - 16 = 0
3x - 16 = 0
3x = 16
x = 16/3
X intercepts are ([tex]\frac{16}{3}[/tex],0)
Answer:
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Answers
Answer:
like what type of help that i could help u
Answer:
I think it might be 6.75x - 19.25 = 80
Step-by-step explanation:
6.75x−19.25=80
Step 1: Add 19.25 to both sides.
6.75x−19.25+19.25=80+19.25
6.75x=99.25
Step 2: Divide both sides by 6.75.
6.75x/6.75 = 99.25/6.75
x=14.703704
what would be the slope?
Answers
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Answer:
64 cm^2
Step-by-step explanation:
SA = s^2 + 2sl
= 4^2 + 2(4)(6)
= 64 cm^2
Solve for x: −3x + 3 −1
x −3
Answers
i need help with this asap! i will give brainliest!!
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Answer:
97
Step-by-step explanation:
Angle on a straight line = 180
106 + ∠st = 180
∠st = 180 - 106 = 74
x = ∠st + 23
= 74 + 23
= 97
Answer:
51 degrees
Step-by-step explanation:
This is a scalene triangle. Which means it sums up to 180 degrees. Therefore, you have to add up all the degrees to 180. 106+23 is 129, and 180 - 129 is 51.
The area of a triangle can be found using the formula:
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Find the area of the triangle pictured below where the measurements are given in meters, (M)
2m
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Answers
Answer:
5 squared units
Step-by-step explanation:
Area of triangle
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Which size bottle of ketchup is the best deal with the lowest unit price?
Prices for Different Sizes of Bottles of Ketchup
Size Bottle
Price
10 oz.
$2.50
14 oz.
$2.80
16 oz.
$4.00
18 oz.
$5.40
Answers
Answer:
14oz for $2.80
Step-by-step explanation:
Well to determine the unit prices you must divide the price by whatever the weight is. As so:
10oz: 2.5/10=0.25
14oz: 2.8/14=0.20
16oz: 4/16=0.25
18oz: 5.4/18=0.30
So your answer is 14oz for $2.80
Answer: I’m pretty sure ur answer would be 14 oz. :)
Step-by-step explanation: good luck !<3
Write the equation 7x - 4y = -12 in slope-intercept form
Answers
The correct answer is: y = 7/4x + 3.
Step-by-step:
Move variables to the right side
-4y = -12 - 7x
Change the signs
4y + 12 + 7x
Divide both sides
y = 3 + 7/4x
Reorder the terms
y = 7/4x + 3
Answer: y = 7/4x + 3
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PLEASE ANSWER!!
A store clerk tells you that if you use a 10% off coupon the $30 jacket you want will only cost $20. What mistake has she made? What is the true cost of the jacket?
Answers
Answer: The true cost of the jacket is $27 dollars.
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2/3 (x - 7) = -2
(please help I need this turned in really soon)
Answers
Answer: x=4
Step-by-step explanation:
Answer:
x = 4
Step-by-step explanation:
[tex]\frac{2}{3} (x-7)=-2\\[/tex]
[tex]\frac{2}{3} x+\frac{-14}{3} =-2[/tex]
[tex]\frac{2}{3}x=\frac{3}{8}[/tex]
[tex]x=4[/tex]
greatest to least 4/10, 0.50, 1/4, 0.06
Answers
Answer:
0.50, 4/10, 1/4, 0.06
Step-by-step explanation:
1/4 = 0.25
4/10 = 0.40
Answer:
OoP NVmM SoRrY- XD
Step-by-step explanation:
^^ Hopefully this works, I'm rooting for you!
rise =
run =
slope =
Answers
21;4
Tahbrdx the rise of the run is the slope over the run
A pool is being filled at a constant rate of 5 gallons every 2 minutes. Which graph has a slope that best represents this rate?
Answers
Answer:
21.4 gpm
Step-by-step explanation
I need help with this question pleaseeee
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Answer: 639
Step-by-step explanation:
i might be wrong but that's how i was taught! :)