Acalifornia water company has determined that the average customer billing is $1 comma 100 per year and the amounts billed have an exponential distribution. a. calculate the probability that a randomly chosen customer would spend more than $4 comma 600. b. compute the probability that a randomly chosen customer would spend more than the average amount spent by all customers of this company. a. the probability that a randomly chosen customer would spend more than $4 comma 600 is nothing.