Question

1. Twenty machines are operated for 100 hours. One machine fails in 60 hours and another fails in 70 hours. What is the mean time between failures?

2. What is the reliability of the same machines from question one above, at (i) 500 hours? (ii) 900 hours?

Answer 1

Answer:

Plz answer only 1 question at one time

Answer 2

Answer:

Sorry I am not eligible to do this...