Question

Semiconductor lasers used in optical storage require higher power levels for write operations than for read operations. Higher power-level operations reduce the useful life of the laser. Lasers in products used for backup of high-speed magnetic disks primarily write & their probability that their useful life exceeds 5 years is 0.95. Lasers that are used for main storage spend an equal amount of time reading and writing, and the probability that the useful life exceeds 5 years is 0.995. For all lasers used in products, 25% are used for backup and 75% are used for main storage.

Answer 1

@whpalmer4 @experimentX

Answer 2

There doesn't appear to be a question in there...