# Statistics

posted by
**Danielle**
.

Exponential distribution was used to model the lengths of CD-ROM drives in a two drive system. The two CD-ROM drives operate independently, and at least one drive must be operating for the sytem to eperate successfully. Both drives have a mean length of life of 25,000 hours.

A. The reliability R(t) of a singel CD-ROM drive is the probability that the life of the drive exceeds t hours. Give a formula for R(t).

B. Use the result from part A to find the probabiity that the life of the single CD-ROM drive exceeds 8,760 hours