Answer:
Fast Auto Service provides a lubrication service for cars. It is known that the mean time taken for this
service is 15 minutes per car and the standard deviation is 2.4 minutes. Assume that the times taken for the service for all cars have a normal distribution If a service time is selected at random, find the
probability that the time is:
(i) more than 18 minutes
(ii) less than 10 minutes
(iii) between 12 and 16 minutes (10 marks)