Chapter 4, Problem 8E

(a)

To determine

To Explain: the distribution.

Explanation of Solution

Given:

  

The distribution is about to normal, but looks to be slightly divided and has two distinct peaks. There are peaks would be around 64 in and 72 in.

(b)

To determine

To find: the account for the features seen here.

Explanation of Solution

Given:

  

Yes, it is likely because of male and female genders.

Males are normally taller than females; this is on average. If there are two distinct gender populations, it would make sense to have one the males group be have a slightly higher average than the other the females group.