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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 0 123 45 6 p(x)0.10 0.15 0.18 0.27 0.20 0.06 0.04 Calculate the cdf F(x) 6 4 0 F(x) Graph the cdf F(x) F(x) F(x) 1.0 1.0 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0.0 0.0 2 34 2 34

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