Cafe Espresso is a very popular coffee shop at UCI. The owner of Cafe Espresso notices that on average 85 customers order coffee on a given day. Let X be the number of customers who order coffee at Cafe Espresso, and we will assume that E[X] = 85. (a) Assume that the expected value of X is a constant daily rate and the number of customers who order coffee at Cafe Espresso is independent of any other day. What is the distribution of X? Justify your answer. (b) Using the distribution from part (a), what is the Mean and Standard Deviation of the number of customers who order coffee at cafe express in a give day. (c) Using the distributing from part (a), what is the probability that at least 81 customers order coffee at Cafe Espresso in a given day?

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Cafe Espresso is a very popular coffee shop at UCI. The owner of Cafe Espresso notices that on average
85 customers order coffee on a given day. Let X be the number of customers who order coffee at Cafe
Espresso, and we will assume that E[X] = 85.
(a) Assume that the expected value of X is a constant daily rate and the number of customers who
order coffee at Cafe Espresso is independent of any other day. What is the distribution of X?
Justify your answer.
(b) Using the distribution from part (a), what is the Mean and Standard Deviation of the number of
customers who order coffee at cafe express in a give day.
(c) Using the distributing from part (a), what is the probability that at least 81 customers order coffee
at Cafe Espresso in a given day?
(d) Suppose that the number of costumers who order coffee at Cafe Espresso in any increment of time
is independent of the number of costumer who order coffee at Cafe Espresso in any other increment
of time. Suppose that Cafe Espresso only opens between 6:00am and 3:00pm. 1) What is the
probability that at least 11 costumer order coffee in one hour during a given day? 2) What is the
probability that no costumer order coffee in one hour during a given day?
(e) Using the assumption from above, what is the expected number of customers who order coffee at
Cafe Espresso in one quarter? Assume that each day is independent of the other days and that
there are 70 days in a quarter.
Transcribed Image Text:Cafe Espresso is a very popular coffee shop at UCI. The owner of Cafe Espresso notices that on average 85 customers order coffee on a given day. Let X be the number of customers who order coffee at Cafe Espresso, and we will assume that E[X] = 85. (a) Assume that the expected value of X is a constant daily rate and the number of customers who order coffee at Cafe Espresso is independent of any other day. What is the distribution of X? Justify your answer. (b) Using the distribution from part (a), what is the Mean and Standard Deviation of the number of customers who order coffee at cafe express in a give day. (c) Using the distributing from part (a), what is the probability that at least 81 customers order coffee at Cafe Espresso in a given day? (d) Suppose that the number of costumers who order coffee at Cafe Espresso in any increment of time is independent of the number of costumer who order coffee at Cafe Espresso in any other increment of time. Suppose that Cafe Espresso only opens between 6:00am and 3:00pm. 1) What is the probability that at least 11 costumer order coffee in one hour during a given day? 2) What is the probability that no costumer order coffee in one hour during a given day? (e) Using the assumption from above, what is the expected number of customers who order coffee at Cafe Espresso in one quarter? Assume that each day is independent of the other days and that there are 70 days in a quarter.
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