A real estate office wants to make a survey in a certain town, which has 50,000 households, to determine how far the head of household has to commute to work. A simple random sample of 1,000 households is chosen, the occupants are interviewed, and it is found that on average, the heads of the sample households commuted 8.7 miles to work; the SD of the distances was 9.0 miles. (All distances are one-way; if someone isn't working, the commute distance is defined to be 0.)
a) The average commute distance of all 50,000 heads of households in the town is estimated as ____, and this estimate is likely to be off by ___ or so.
b) If possible, find a 90% confidence interval for the average commute distance of all heads of households in the town. If this isn't possible, explain why not.

Answer:

The club has 56 members

Step-by-step explanation:

We can set up a ratio problem to find the total number of kids in the club. There are two ways to do this, and I will show you both. The first way is to immediately set up a ratio between the number of boys and the number of total members in the club. Since the ratio of girls to boys is 6:2, the ratio of boys to members is 2:8 (add the number of girls and boys in the ratio to get the total number of people). Now, we can set up an equation, letting x equal the number of members total, and solve using cross multiplication:

[tex]\frac{2}{8}=\frac{14}{x}\\\\ 112=2x\\\\ x=56[/tex]

The other way to solve this problem would be to figure out the number of girls in the club if there are 14 boys and then add the two quantities together. If we let y be the number of girls in the club, we get the following solution:

[tex]\frac{6}{2}=\frac{y}{14}\\\\ 2y=84\\\\ y=42\\\\x+y=56[/tex]

Either way, we get that the total number of members is 56

Answer: x=-1,5.

Step-by-step explanation:

[tex]y=3x^2+9x\\\boxed {x=-\frac{b}{2a} }\\a=3,\ \ \ \ \ b=9.\\x=-\frac{9}{2*3}=-\frac{3}{2}=-1,5.[/tex]

360

Step-by-step explanation:

The experimental probability is 5/14.

Since, 4 appeared five times over the total, The experimental probability is 5/14.

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Answer: 33 degrees

Step-by-step explanation:

Angles inscribed in the same arc are congruent, so

[tex]13+4x=-7+8x\\\\20+4x=8x\\\\20=4x\\\\x=5\\\\\implies m\angle CDE=-7+5(8)=33^{\circ}[/tex]

Answer:

Step-by-step explanation:

Answer:

Yes.

Step-by-step explanation:

It is a polynomial with degree 2 ( as it has x^2 as its highest power)

Answer: H

Step-by-step explanation:

TY:XY: = 2:5, not 3:5.

Answer:

H H H H H H H

Step-by-step explanation:

TY:XY: =2:5, NOT 3:5.

Answer:

Firstly, we'll apply the below identity.

[tex]{\boxed{\sf{(a+b)^{2} = a^{2} + b^{2} +2ab}}}[/tex]

Applying the above identity.

⇒ (√5 + √2)²

⇒ (√5)² + (√2)² + 2×(√5)×(√2)

⇒ 5 + 2 + 2√10

⇒ 7 + 2√10

Comparing the LHS and RHS

⇒ 7 + 2√10 = a + b√10

∴ a = 7 and b = 2.

Answer: DL, PS, SL

Step-by-step explanation:

All sides of a square are congruent.

Hence, The value of x in the congruent triangles abc and dec is 1

the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs.

The question implies that the triangles abc and dec are congruent triangles.

The congruent sides are,

ab = de

bc = ce = 4

ac = cd = 5

The congruent side ab = de implies that,

4x - 1 = x + 2

Collect like terms,

4x - x = 2 + 1

Evaluate the like terms,

3x = 3

Divide through by 3

x = 1

Hence, the value of x is 1

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Answer:

307 paces

Step-by-step explanation:

First, lets convert Robert's pace to metres. (cm > m)

75cm = (75/100)m

= 0.75m

Number of Full Paces = Length of Bridge / 1 Full Pace

=

[tex] \frac{230m}{0.75m} \\ = 306 \frac{2}{3} paces[/tex]

See , we must have full paces, and in this case we are finding the minimum number of paces, so we will be looking at the lowest possible whole number, which in this case, is 307 paces.

Answer:21

Step-by-step explanation:

Answer:

6/5 or 1.2, they're the same value

Step-by-step explanation:

When it says "rate of change", it's really just asking for the slope. If you don't know what the slope is, essentially how much the y-value increases by whenever x increases by 1. This can be formally defined using the equation: [tex]\frac{y_2-y_1}{x_2-x_1}[/tex] which is essentially [tex]\frac{rise}{run}[/tex]. The subtraction is finding the difference between the two numbers to see how much it's changed by. Btw the order doesn't matter, I could plug in (-3, -2) as (x2, y2) or I could plug it in as (x1, y1) as long as I make sure to input it in correctly. In this example I'll just say (-3, -2) = (x1, y1) and (2, 4) = (x2, y2). Plugging these values into the equation gives you: [tex]\frac{4- (-2)}{2- (-3)} = \frac{6}{5}[/tex] that's the rate of change

[tex] \qquad \qquad \bf \huge\star \: \: \large{ \underline{Answer} } \huge \: \: \star[/tex]

[tex]\textsf{ \underline{\underline{Steps to solve the problem} }:}[/tex]

Both the figures are similar to each other, so ratio of their corresponding sides will be equal to one another.

[tex] \qquad❖ \: \sf \: \dfrac{2.6}{5.4} = \dfrac{x}{6.21} [/tex]

( taking missing width be x )

[tex] \qquad❖ \: \sf \: x = \dfrac{1.3}{2.7} \sdot6.21[/tex]

[tex] \qquad❖ \: \sf \: x = {(1.3)}{} \sdot(2.3)[/tex]

[tex] \qquad❖ \: \sf \:x = 2.99 \: \: in[/tex]

[tex] \qquad \large \sf {Conclusion} : [/tex]

Missing side measures : 2.99 inches

Answer:

20% of the garden is in chillies.

Step-by-step explanation:

[tex] \frac{4.5 \times 2}{9 \times 5} = \frac{9}{45} = \frac{1}{5} = 20\%[/tex]

Answer:

153

Step-by-step explanation:

The formula for a triangle is 1/2 x base x height

17 x 18 = 306

306 x 1/2 = 153

So therefore your answer would be 153.

If you like my answer and explanation, mark me as brainliest!

Answer:

A = 18 units²

Step-by-step explanation:

MNOP is a parallelogram whose area ( A) is calculated as

A = bh ( b is the base and h the perpendicular height )

here b = 6 and h = 3 , then

A = 6 × 3 = 18 units²

Let's take these problems step-by-step:

To solve these problem, simply plug in the values in parentheses in front of f:

 [tex]f(a) = 6a - 8\\\\f(a+h) = 6(a+h)-8=6a + 6h - 8\\\\\frac{f(a+h)-f(a)}{h} =\frac{(6a+6h-8)-(6a-8)}{h} =\frac{6a+6h-8-6a+8}{h} =\frac{6h}{6}=h[/tex]

Hope that helps!

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Applying the knowledge of fractions, the bigger one is: one-sixth of 138.

Fractions can be defined as a part of a digit or number, and are not whole numbers. For example, a third is 1/3, one-sixth is 1/6, which are both fractions.

Therefore, let's evaluate each statement:

1/3 of 45 = 1/3 × 45 = 15

1/6 of 138 = 1/6 × 138 = 23

Therefore, the bigger of the two is: one-sixth of 138.

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The formula of g(x) is g(x) = -0.8x - 1.6

The equation is given as:

-4x - 6 = 5y + 2

Subtract 2 from both sides

5y = -4x - 8

Divide through by 5

y = -0.8x - 1.6

Express as a function

g(x) = -0.8x - 1.6

Hence, the formula of g(x) is g(x) = -0.8x - 1.6

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Answer:

Fraction form: -3 4/7

Decimal form: -3.57142

Step-by-step explanation:

convert mixed number to improper fractions

apply the fraction rule a/b * c/d = a * c / b * d

Factor the number

cancel the common factor

multiply the numbers

Conver improper fraction to mixed numbers

To get your final answer:

= -3 4/7

Hope this helps! :)

Answer: fx=−14

Step-by-step explanation:

Answer:

103.75 score

Step-by-step explanation:

10 % scored higher than the mean?

 50% is the mean %   so we need to look for the z score corresponding to 60 %    from z-score table   this is z-score of   .25

.25 standard deviations (which is 15)   above 100 =

    .25  * 15       +   100 = 103.75   score

Answer:

4

Step-by-step explanation:

The formula is P = 2(l +w)

w = P/2 - l = 20/2 - 6 = 4m

Answer:

Step-by-step explanation:

The probability of pulling out a red marble 3 times in a row will be 1/64.

Its basic premise is that something will almost certainly happen. The percentage of favorable events to the total number of occurrences.

Marbles: You have a bag with 3 red marbles, 4 blue marbles, and 5 green marbles.

Then the probability of pulling out a red marble 3 times in a row will be

The total number of events will be

Total events = 3 + 4 + 5 = 12

The favorable event will be

Favorable event = 3

Then the probability will be

P = (3/12)(3/12)(3/12)

P = (1/4)(1/4)(1/4)

P = 1/64

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The standard form of the expression (6.8x10³)x(1.3x10⁻³) is 8.84 × 10⁰.

In mathematics, integer exponents are exponents that should be integers. It may be a positive or negative number. In this situation, the positive integer exponents determine the number of times the base number should be multiplied by itself.

We have:

Mathematical expression:

= (6.8x10³)x(1.3x10⁻³)

= 6.8x1.3

= 8.84

= 8.84 × 10⁰

Thus, the standard form of the expression (6.8x10³)x(1.3x10⁻³) is 8.84 × 10⁰.

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Answer:

46 cm²

Step-by-step explanation:

Find the area of the rectangle and the triangle, then subtract. Take a look at the steps to know how.

The area of the rectangle:

10×7=70

Area of triangle:

1/2×6×8=24

Subtract the area of the triangle from the area of the rectangle.

70-24=46.

The area of the new shape is 46 cm².

It is cm² because it is a 2D object.

Hope this helps!