1. A company produces batteries. The lifetime of all the batteries in the company is a normal distribution with mean58 hours and standard deviationhours. Suppose you are the quality control manager of this battery company. On each day, you need to select a sample ofbatteries. The sample mean is, and you findapproximately follows a normal distribution with standard deviation 2 hours.

(a) What is the sample size?

(b) ComputeP(x<60)