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2 years ago

What is4/15 as a ratio

Mathematics

1 answer:

larisa86 [58]2 years ago

6 0

4:15

..............

4/15 = 4:15

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If y varies directly as x, and y is 180 when x is n and y is n when x is 5, what is the value of n?

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Answer:

Step-by-step explanation:

y=k*x

180=k*n

n=k*5

180=k*k*5. so k*k=36, k=6

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Step-by-step explanation:

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2 years ago

Evulate: m/5 When: m= 30

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Answer:

Step-by-step explanation:

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3 years ago

A large on-demand, video streaming company is designing a large-scale survey to determine the mean amount of time corporate exec

Firdavs [7]

Answer:

554 executives should be surveyed.

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 Z-table as such z has a p-value of $1 - \alpha$ .

That 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.

Standard deviation of 3 hours.

This means that $\sigma = 3$

The 95% level of confidence is to be used. How many executives should be surveyed?

n executives should be surveyed, and n is found with $M = 0.25$ . So

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

$0.25 = 1.96\frac{3}{\sqrt{n}}$

$0.25\sqrt{n} = 1.96*3$

$\sqrt{n} = \frac{1.96*3}{0.25}$

$(\sqrt{n})^2 = (\frac{1.96*3}{0.25})^2$

$n = 553.2$

Rounding up:

554 executives should be surveyed.

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3 years ago

What is 12n^2m^4n/28n^4m^3 simplified?

Serggg [28]

The answer is

288m^2n/7.

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What is4/15 as a ratio​

What is4/15 as a ratio