If the PDF of a customer service center is f(x)=0.13x^0.25e^-(x/2.7)^0.35, for >= 0,
a. What is the MTTR
b. What is the probability that a waiter will have to serve for more than 2.8 hours
c. what is the probability that 7 of the 10 waiters will have to wait more than 2.8 hours
d. what is the median service time?