Section 3.2 Problems 2- A mail-order computer business has six telephone lines. LetX denote the number of lines in use at a specied time. Suppose the prof of X is as given in the accompanying table. x 0 1 2 3 4 5 6 p{x) 0.10 0.15 0.20 0.25 0.20 0.06 0.04 Calculate the probability of each of the following events. a. {at most three lines are in use} b. {fewer than three lines are in use} {at least three lines are in use} {between two and ve lines, inclusive, are in use} {between two and four lines, inclusive, are not in use} {at least four lines are not in use} rm 9-9