2 years ago

Question from my math test

Mathematics

1 answer:

frutty [35]2 years ago

4 0

Answer:

The manager skipped June

Step-by-step explanation:

In the first bar we can see the sales are from

January - February

Then,

March - April.

But then, the store manager goes from

May - July,

and totally skipped June, therefore making it look like the sales have increased.

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3 3/5

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2 years ago

Find the sample size required to achieve the given margin of error with SD = 51.02 and z - score = 1.96. Round your answer to th

coldgirl [10]

Answer:

The sample size required is 2500.

Step-by-step explanation:

z-score:

In function of the margin of error M, the z-score is given by:

$Z = \frac{M}{\frac{\sigma}{\sqrt{n}}} = \frac{M\sqrt{n}}{\sigma}$

In this question, we have that:

$\sigma = 51.02, M = 2, Z = 1.96$

$Z = \frac{M\sqrt{n}}{\sigma}$

$1.96 = \frac{2\sqrt{n}}{51.02}$

$2\sqrt{n} = 51.02*1.96$

$\sqrt{n} = \frac{51.02*1.96}{2}$

$(\sqrt{n})^2 = (\frac{51.02*1.96}{2})^2$

$n = 2500$

The sample size required is 2500.

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3 years ago

The price of a wallet is $31.95 and the sales tax is 7.5%.

Musya8 [376]

Answer:

34.35

Step-by-step explanation:

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3 years ago

If f(x)=25-x^2 and g(x)=x+5, what is (f/g)(x)? Write your answer in the simplest form.

Flura [38]

F(x) = -x² + 25
g(x) = x + 5

(f ÷ g)(x) = ⁻ˣ²⁺²⁵/ₓ₊₅
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