A mail-order company 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) 0.11 0.15 0.20 0.25 0.19 0.09 0.01   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} (c) {at least three lines are in use}

Q: A mail-order company business has six telephone lines. Let X denote the number of lines in use at a…

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