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Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.5 - Problem 4cqq
Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.5 - Problem 4cqq

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

ISBN: 9780321836960 18

## Solution for problem 4CQQ Chapter 5.5

Elementary Statistics | 12th Edition

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Problem 4CQQ

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

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)

= 200 - 2(10)

= 180

maximum: mean + 2(standard deviation)

= 200 + 2(10)

= 220

Yes the result of 232 girls in 400 births unusually high of girls.

Step 2 of 1

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