Lexie is waiting for a train. If X is the amount of time before the next train arrives, and X is uniform with values between 4 and 11 minutes, then what is the average (mean) time for how long she will wait

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  =  

                                  =  

                                  = 7.5

The average time for Lexie to wait for the next train would be 7.5 minutes.

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option number c is the right answer.