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3 years ago

Yeah so 5mi/h =?km/h

Mathematics

1 answer:

tamaranim1 [39]3 years ago

8 0

Answer:

80 kilometers

Step-by-step explanation:

Since the number of miles and number of km is over one hour, the only thing you need to worry about it the number of miles in a kilometer (the numerator).

1 mile is approximately 1.60934 kilometers, so to find how many kilometers are in 50 miles, you would multiply 1.60934 by 50.

1.60934 * 50 = 80.467

Since 50 miles is rounded to the nearest whole number, I expect that the kilometers should be given in the nearest whole number, so the final answer is 80 kilometers.

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Step-by-step explanation:

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2 years ago

A rectangular prism has a base that is 6 m by 3.5 m in the prism is 9 m high what is the surface area of the prism

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Answer:

213 meters squared

Step-by-step explanation:

The surface area of a rectangular prism is found using the formula A=2(wl+hl+hw). Here substitute l = 6, w = 3.5 and h = 9.

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3 years ago

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2 years ago

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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the

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Answer:

A sample size of at least 1,353,733 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

You would like to be 98% confident that you esimate is within 0.1% of the true population proportion. How large of a sample size is required?

We need a sample size of at least n.

n is found when M = 0.001.

Since we don't have an estimate for the proportion, we use the worst case scenario, that is $\pi = 0.5$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.001 = 2.327\sqrt{\frac{0.5*0.5}{n}}$

$0.001\sqrt{n} = 2.327*0.5$

$\sqrt{n} = \frac{2.327*0.5}{0.001}$

$(\sqrt{n})^{2} = (\frac{2.327*0.5}{0.001})^{2}$

$n = 1353732.25$

Rounding up

A sample size of at least 1,353,733 is required.

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3 years ago

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Yeah so 5mi/h =?km/h​

Yeah so 5mi/h =?km/h