Ann is expected at 7:00 pm after an all-day drive. She may be as much as 1 h early or as much as 3 h late.

Ann is expected at 7:00 pm after an all-day drive.She may be as much as 1 h early or as much as3 h late. Assuming that her arrival time X isuniformly distributed over that interval, find thepdf of |X - 7|, the unsigned difference betweenher actual and predicted arrival times