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# If boys and girls are equally likely, groups of 400 births

## Problem 4CQQ Chapter 5.5

Elementary Statistics | 12th Edition

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Elementary Statistics | 12th Edition

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Problem 4CQQ

If boys and girls are equally likely, groups of 400 births have a mean of 200 girls and a standard deviation of 10 girls. Is 232 girls in 400 births an unusually high number of girls?

Step-by-Step Solution:

Step 1 of 1</p>

Using the range rule of thumb to find the minimum usual value μ – 2σ and the maximum usual value μ – 2σ.

minimum:  mean - 2(standard deviation)

...

Step 2 of 3

Step 3 of 3

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