The time taken for servicing a car has an average time of 17 minutes and a standard deviation of 2.2 minutes. If the service times are approximately normally distributed, a)Find the probability that...

The time taken for servicing a car has an average time of 17 minutes and a standard deviation of 2.2 minutes. If the service times are approximately normally distributed,

a)Find the probability that the time taken for servicing Ali’s car is between 15 to 20 minutes.

b)What is the maximin service time for 90% of the cars?