Please clearly show all steps. Thank you!

6. The minimum fatigue life of rivets in the fuselage of a certain type of aircraft is modeled with a two-parameter Weibull distribution ( & = 0). During accelerated testing for the purpose of certification and approval by the FAA, the mean value of minimum life is found to be 90 minutes and the coefficient of variation is 15%. The rivet design is unacceptable if the minimum life during accelerated testing is less than 50 minutes. What is the probability of non-acceptance of the rivet design