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# Mean height of males aged 18 - 24

According to the U.S. National Center for Health Statistics, the mean height of 18 -24 year old American males is = 69.7 inches. Assume the heights are normally distributed with a standard deviation of 2.7.

Fill in the following blanks:
a. About 68.26% of 18 -24 year old American males are between __ and __ inches tall.

b. About 95.44% of 18 -24 year old American males are between __ and __ inches tall.

c. About 99.74% of 18 -24 year old American males are between __ and __ inches tall.

#### Solution Preview

Here we have
Mean = 69.7 and SD = 2.7

Fill in the following blanks:

a. About 68.26% of 18 -24 year old American males are between and inches tall.

68.26% interval is given as
Lower Limit = Mean - 1*SD = 69.7 - 1*2.7 = 67
Upper Limit ...

#### Solution Summary

This solution is comprised of a detailed explanation for confidence interval for mean using hand calculations. In this solution, step-by-step explanation of this complicated topic provides students with a clear perspective of confidence interval for mean with the help hand calculations. Formulas are added in word file for better understanding and interpretation is given at the end of every question

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