4.31 Customers at a coffee shop. A coffee shop serves an average of 75 customers per hour during the morning rush. (a) Which distribution have we studied that is most appropriate for calculating the probability of a given number of customers arriving within one hour during this time of day?
(b) What are the mean and the standard deviation of the number of customers this coffee shop serves in one hour during this time of day?
(c) Would it be considered unusually low if only 60 customers showed up to this coffee shop in one hour during this time of day? (d) Calculate the probability that this coffee shop serves 70 customers in one hour during this time of day.​