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3 years ago

7

2 horses ran from the same place from the at same time one horse ran at 2 miles per second and the other ran at a speed for 18 m

iles per second. how far apart were they in 1 minute? in 5 minutes? in 8 minutes?

1 answer:

RSB [31]3 years ago

4 0

Answer:

no horse can run 18 miles per second or even 2 miles per second.

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Given

<u>Brand A</u> <u>Brand B</u>

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$\sigma_1 = 8.7$ $\sigma_2 = 7.5$

Required

Determine the test statistic (t)

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$t = \frac{\bar x_1 - \bar x_2}{s\sqrt{\frac{1}{n_1} + \frac{1}{n_2}}}$

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$s = \sqrt{\frac{(n_1-1)*\sigma_1^2+(n_2-1)*\sigma_2^2}{n_1+n_2-2}}$

The equation becomes:

$s = \sqrt{\frac{(12-1)*8.7^2+(12-1)*7.5^2}{12+12-2}}$

$s = \sqrt{\frac{1451.34}{22}}$

$s = \sqrt{65.97}$

$s = 8.12$

So:

$t = \frac{\bar x_1 - \bar x_2}{s\sqrt{\frac{1}{n_1} + \frac{1}{n_2}}}$

$t = \frac{21.8 - 18.9}{8.12 * \sqrt{\frac{1}{12} + \frac{1}{12}}}$

$t = \frac{21.8 - 18.9}{8.12 * \sqrt{\frac{1}{6}}}$

$t = \frac{21.8 - 18.9}{8.12 * 0.408}}$

$t = \frac{2.9}{3.31296}}$

$t = 0.875$

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Answer:

A

Step-by-step explanation:

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