Wil I. Fail, a reliability engineer for Major Motors, has the task of testing 20 alternators of a…

Wil I. Fail, a reliability engineer for Major Motors, has
the task of testing 20 alternators of a new design in order to estimate their
reliability. He terminated the test after 1 {] failures with the following
failure times (in operating hours):

(a) Assuming a CFR model, estimate the MTTF.

(b) On the basis of (a), what is the expected test time if
Wi 1 conducts a second test witiJ 25 items placed on test and stops after
observing 50 failures? He will immediately replace failed units on test.

(c) What is the expected number of failures in the first 700
hours of testing?