Renuka Jain's Car Wash takes a constant time of 4.0 minutes in its automated car wash cycle. Autos arrive following a Poisson distribution at the rate of 10 per hour. Renuka wants to know:
a) The average wait time in the line = ___ minutes (round your response to two decimal places)
b) The average number of customers waiting in the line = ___ cars (Response should be rounded to nearest 2nd decimal place)