complete all parts

The amount of time of an iPhone battery lasts before it fails is normally distributed with mean 5.2 years and standard deviation of 1.3 years. a. Find the probability that a randomly selected iPhone will have a battery that dies within 3 years of purchase. b. Say, Apple sold 150,000 of iPhones this week. If they offer a two-year warranty, What percent could they expect to be returned? li. How many would they expect to be returned? .What is the maximum lifetime of the lowest 10% of iPhone batteries? d. What is the percentile rank for an iPhone battery that lasts 6 years