The waitingline at a popularbakery shop can be quitelong. Suppose that the waiting time in minuteshas probability density function

() = {(0.1)^(0.1), < > 0

0, o.w

Determine the following:

a. ().

b.Probability that a customer waits more than 20 minutes.

c.Probability that a customer waits more than 20 minutes given that s/he waits at least 4 minutes.

Please help a b c questions