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3 years ago

Mrs. Friedmon baked a walnut cake for her class.

Mathematics

1 answer:

Setler [38]3 years ago

5 0

That's great.. I'm allergic to walnuts but good for the class. What if some students have allergies though?

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___% of 200 miles is 150 miles

steposvetlana [31]

The answer is 75%..
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4 years ago

Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoc

Bingel [31]

Answer:

We need a sample size of at least 719

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How large a sample size is required to vary population mean within 0.30 seat of the sample mean with 95% confidence interval?

This is at least n, in which n is found when $M = 0.3, \sigma = 4.103$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.3 = 1.96*\frac{4.103}{\sqrt{n}}$

$0.3\sqrt{n} = 1.96*4.103$

$\sqrt{n} = \frac{1.96*4.103}{0.3}$

$(\sqrt{n})^{2} = (\frac{1.96*4.103}{0.3})^{2}$

$n = 718.57$

Rouding up

We need a sample size of at least 719

6 0

3 years ago

Ben made a model (shown below) of the square pyramid he plans to build when he grows up. Find the surface area of the model.

OverLord2011 [107]

Answer:

The surface area of the model is $SA=240\ m^{2}$

Step-by-step explanation:

we know that

The surface area of the square pyramid is equal to the area of the square base plus the area of four lateral triangles

$SA=10*10+4(\frac{1}{2}(10)(7))\\ SA=100+140\\SA=240\ m^{2}$

3 0

3 years ago

Read 2 more answers

Write in standard form

Alika [10]

Answer:

The equation was y= -3/4x + 19/4 in slope-intercept form, but it is x + 4/3y= 19/3

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3 years ago

Plz help me

mojhsa [17]

Answer: 3rd one

Step-by-step explanation:

8 0

4 years ago