A busy restaurant determined that between 6:30 P.M. and 9:30 P.M. on Friday nights, the time between arrivals of customers follows an exponential distribution with an average of 0.41 minutes.
a) What is the probability that 10 minutes or more will elapse between arrivals?
b) What is the probability that between 20 and 40 seconds will elapse between arrivals?
c) What is the probability that less than a minute will elapse between arrivals?