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Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.5 - Problem 5cqq
Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.5 - Problem 5cqq

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# Solved: If boys and girls are equally likely, groups of ISBN: 9780321836960 18

## Solution for problem 5CQQ Chapter 5.5

Elementary Statistics | 12th Edition

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Problem 5CQQ

Problem 5CQQ

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 185 girls in 400 births an unusually low number of girls?

Step-by-Step Solution:

Step 1:

Given that,If boys and girls are equally likely, groups of 400 births have a mean of 200 girls and a standard deviation of 10 girls.

Here , n  = 400,  = 10.

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

No, because 185 girls is within two standard deviations of the mean.

i.e, 180 < 185 < 220.

Step 2 of 1

##### ISBN: 9780321836960

This full solution covers the following key subjects: girls, births, groups, deviation, equally. This expansive textbook survival guide covers 121 chapters, and 3629 solutions. The full step-by-step solution to problem: 5CQQ from chapter: 5.5 was answered by , our top Statistics solution expert on 03/15/17, 10:30PM. Elementary Statistics was written by and is associated to the ISBN: 9780321836960. Since the solution to 5CQQ from 5.5 chapter was answered, more than 331 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Elementary Statistics, edition: 12. The answer to “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 185 girls in 400 births an unusually low number of girls?” is broken down into a number of easy to follow steps, and 36 words.

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