An electronic switch has a constant failure rate of 10-3 per hour. a) What is the expected life of the switch? b) What is the standard deviation of the switch? c) What is the probability that the switch will last between 1200 and 1400 hours?

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?