Answer:
The average (mean) time for her to wait is 7.5 minutes before the arrival of the next train.
Explanation:
The values between 4 and 11 minutes are: 5, 6, 7, 8, 9, and 10.
Since X has a uniform value between 4 and 11, then
average time = [tex]\frac{5+ 6+ 7+ 8+ 9+ 10}{6}[/tex]
= [tex]\frac{45}{6}[/tex]
= 7.5
The average time for Lexie to wait for the next train would be 7.5 minutes.
