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3 years ago

What percentage of boys ate grapes

Mathematics

2 answers:

qaws [65]3 years ago

8 0

Answer:

40% of the boys ate grapes :)

Thank you

Amiraneli [1.4K]3 years ago

6 0

40 percent of boy ate grapes

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You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

timama [110]

Answer:

the number of families needed for the survey is 2,157

Step-by-step explanation:

The computation of the number of families needed for the survey is shown below:

Given that

The Standard deviation is $900

Service level = 99%

z value at 99% = 2.58

Expenditures = $50

Based on the above information

The number of families needed for the survey is

$n = (\frac{zs}{E})^2\\\\= (\frac{2.58\times 900}{50})^2$

= 2,157

Hence, the number of families needed for the survey is 2,157

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3 years ago

What is the vertex of the parabola y=2x2+20x-15?<br><br> (5, 135)<br> (-5, -165)<br> (-5, -65)

maria [59]

Answer:

-296=2×2+20×-15that is the answer

Step-by-step explanation:

you need to calculate the equation step by step to get to the answer

5 0

3 years ago

A sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's p

charle [14.2K]

Answer:

So the value of the test statistic is -0.85.

Step-by-step explanation:

We know that a sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 54% of the chips do not fail in the first 1000 hours of their use.

We get that:

$n=1800\\\\p_1=53\%=0.53\\\\p_2=54\%=0.54\\$

We calculate the standar deviation:

$\sigma=\sqrt{\frac{0.53 \cdot (1-0.53)}{n}}=\sqrt{\frac{0.53 \cdot 0.47}{1800}}=0.01176$

We calculate the value of the test statistic:

$z=\frac{p_1-p_2}{\sigma}=\frac{0.53-0.54}{0.01176}=-0.85$

So the value of the test statistic is -0.85.

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4 years ago

Ward is planning to install a new countertop in his kitchen, as shown in the figure. find the area of the countertop.

Nady [450]

The area of the shape is 26 square feet.

This is a composite shape. It is made up of a trapezoid at the top and two identical parallelograms on the sides.

Here are the formulas for the area of each.

Trapezoid:
0.5(2)(6 + 8) = 14

Parallelogram:
2(3) = 6

Now, just add up the 3 parts:
14 + 6 + 6 = 26

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3 years ago

Amy walks 2 miles 60° north of east from her house as represented in the vector diagram.

kirill [66]

Answer:

Step-by-step explanation:

It’s c

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3 years ago

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