The drive-thru times at Tim Horton’s are normally distributedwith µ = 138.5 seconds and σ = 29 seconds.
(a) What is the probability that a randomly selected car willget through the drive-thru in less than 100 seconds?
(b) What is the probability that a randomly selected car willspend more than 160 seconds in the drive-thru?
(c) What proportion of cars spend between 2 and 3 minutes in thedrive-thru?
(d) Would it be unusual for a car to spend more than 3 minutesin the drive-thru? Why?
