The number of students that come to your professor's office hours for help follows a Poisson distribution with a mean of 6 students per hour. Suppose that your professor holds office hours for exactly one hour on each weekday.
Suppose that your professor considers it a "slow day" if, during a one hour period, 3 or fewer students come for help. What is the probability of a "slow day"?
What is the probability of at least one "slow day" during any given week (5 days)?