John purchased a cell phone at the price of 15,000 NTD and is told the life distribution of the phone is Weibull with a shape parameter 3 and a scale parameter 6 yr.

(a) What is the MTTF of the phone?

(b) If a 1-year warranty for replacing the failed phone with a brand new one is available, what warrantee price can be accepted by John?

(c) If the continuing second year warranty policy is offered, also with replacement with a new one in case of failure, but it has to be decided at the beginning of purchase, what is the second-year warrantee price can be accepted by John?

#Statistics #Reliability

Thanks in advance