Chapter 11.10, Problem 8PPSE

Solution

To find: The percent of men aged 25 to 34 that are less than 70 in. tall.

  $p\approx 39$

Given information:

Given, the heights of men in a survey are normally distributed about the mean as shown below:

  

Calculation:

From the graph, the approximate percent of men who are 64 in., 65 in., 66 in., 67 in., 68 in., and 69 in. are 1, 3, 5, 6, 11 and 13 respectively.

Hence, the percent of men aged 25 to 34 that are less than 70 in. tall is given by:

  $\begin{array}{c}p\approx 1+3+5+6+11+13\\ \approx 39\end{array}$

Conclusion:

  $p\approx 39$