=+21. Suppose that your morning waiting time for a bus has a uniform distribution on the interval from 0 to 5 min, and your afternoon waiting time also has this distribution. Then if x denotes the total waiting time on any particular day, the density function of x can be shown to be f (x) 5 c

.04x for 0 , x , 5

.4 2 .04x for 5 # x , 10