Let X denote the number of telephone lines in use at an online business. Suppose there are 6 lines and
p(0) = .1, p(1) = .15, p(2) = .2, p(3) = .25, p(4) = .2, p(5) = .06, and p(6) = .04.
First, construct the probability distribution table and derive the cumulative distribution function and use both the answer the following questions.
Question 5: Probability that at most 3 lines are in use