Write the answer in paper, then explain it

If the repair time for consumer computer hardware follows a normal distribution with an average value () = 3 hours and a standard deviation () = 1 hour, a. What is the percentage of hardware repairs in less than 2 hours? b. What is the percent hardware repair between 2 - 4 hours? c. If the repair time is more than 5 hours, the customer will receive the repair the next day. What percent of consumers receive repairs the next day?