(last word) the united kingdom’s behavioral insights team substantially increased the amount of income tax collected each year by

a. printing frowning face emoticons on correspondence to delinquent payers.
b. mailing letters to those who had not yet paid, telling them that their neighbors had paid.
c. establishing an automatic payroll withdrawal system to collect taxes.
d. sending delinquent payers pictures of poor children.

Customers arrive at rich dunn's styling shop at a rate of 3 per hour, distributed in a poisson fashion. rich can perform an average of 5 haircuts per hour, according to a negative exponential distribution.a) the average number of customers waiting for haircuts= customersb) the average number of customers in the shop= customersc) the average time a customer waits until it is his or her turn= minutesd) the average time a customer spends in the shop= minutese) the percentage of time that rich is busy= percent