(Solved): The manager of a supermarket tracked the amount of time needed for customers to be served by the cas ...

The manager of a supermarket tracked the amount of time needed for customers to be served by the cashier. After checking with her statistics professoc. she concluded that the checkout times are exponentially distributed with a mean of 5.5 minutes. a) What propotion of customers require more than 12 minutes to check out? Proportion =

b) What is the probability that it takes 16.5 minutes for the 4 th checkout? Answer =

c) What is the probability that in 44 minutes, we had 9 checkouts? Answer =