b Determine the variance of the life of the CPU Round your a

b) Determine the variance of the life of the CPU. (Round your answer to the nearest integer.)

c) What is the probability that the CPU fails before 500 hours? (Round your answer to 3 decimal places.)

Solution

Mean = 389.6169

= 390 hours

Variance = 21007 hours

c) P(X<500) = 0.756

(using gamma funciton calculations_