x = 0 1 2 3 4 5 6 7
P(x)= 3% 4% 6% 7% 15% 25% 30% 10%
What is the chance that a randomly selected patron from this frequent customer reward program stopped by to make purchases at least four (4) days during this stormy week?
and
On average, how many days did these patrons stop by to make purchases during this stormy week? What is the expectation or expected value for this random variable?