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 accompany table. X X Calculate the cdf F(x). F(x) p(x) 0 2 3 4 5 6 1 0.10 0.15 0.18 0.27 0.20 0.07 0.03 0 . 1 2 3 4 5 6

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