the visit of a customer at a restaurant follows a Poissonprocess with a rate of 3 arrivals per week. A day with no visits tothe restaurant is called a risky day.
a. Find the expected number of risky days in a week
b.  Given that a risky day was observed on a Sunday,what is the probability that the next risky day will appear on thefollowing Wednesday?
c. Find the probability that the 4th day, which is Thursday, ofthe week is the second risky day.
