The sole proprietor of a residential real estate office notes that, on the average, telephone inquiries arrive randomly and independently at the rate of four per 8-hour workday. Since the real estate proprietor is often out with clients, she cannot offer immediate responses to some telephone inquiries to her office. (Hint: use the table.)
a) What is the probability that no telephone inquiries arrive during a 2-hour absence from her office during a typical 8-hour workday?
b) What is the probability that there will be at least five telephone inquiries during a typical 8-hour workday?
(Can you also explain how you got the answer)
