A mail-order computer business has six telephone lines. Let X denote the number of lines in use at a specified time. Suppose the pmf of X is as given in the accompanying table. x 0 1 2 3 4 5 6 p(x)     0.12 0.18 0.20 0.20 0.20 0.08 0.02 Calculate the cdf F(x). x 0 1 2 3 4 5 6 F(x)                                                      Graph the cdf F(x). Use the graph to calculate the probabilities of the events given below. (a) {at most three lines are in use} (b) {fewer than three lines are in use} (c) {at least three lines are in use} (d) {between two and five lines, inclusive, are in use}

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