The time for an emergency medical squad to arrive at the sports center at the edge of town is distributed as a normal variable with p. = 17 minutes and a = 3 minutes.
(a) Determine the probability that the time to arrive is:
(i) More than 22 minutes.
(ii) Between 13 and 21 minutes.
(iii) Between 15.5 and 18.5 minutes.
(b) Which arrival period of duration 1 minute is assigned the highest probability by the normal distribution?