98. Let X
the time it takes a read/write head to locate a desired record on a computer disk memory device once the head has been positioned over the correct track. If the disks rotate once every 25 millisec, a reasonable assumption is that X is uniformly distributed on the interval [0, 25].

a. Compute P(10  X  20).

b. Compute P(X  10).

c. Obtain the cdf F(X).

d. Compute E(X) and X.