. (Sec. 4.4) Data collected at Toronto Pearson International Airport suggests that an exponential distribution with mean value 2.735 hours is a good model for rainfall duration. (a) What is the probability that the duration of a particular rainfall event at this location is at least 2 hours? At most 3 hours? Between 2 and 3 hours? (b) What is the probability that the duration of a particular rainfall duration exceeds the mean value by more than 2 standard deviations? What is the probability that it is less than the mean value by more than one standard deviation? (c) What is the value of the median rainfall duration?