a. Use the results of Example 7.5 to obtain a 95% lower confidence bound for the parameter l of an exponential distribution, and calculate the bound based on the data given in the example.
b. If lifetime X has an exponential distribution, the probability that lifetime exceeds t is P(X > t) = e-γt. Use the result of part (a) to obtain a 95% lower confidence bound for the probability that breakdown time exceeds 100 min.