A mailorder computer business has six telephone lines Let X

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.

Calculate the cdf F(x).

x	0	1	2	3	4	5	6
p(x)	0.10	0.18	0.20	0.22	0.20	0.07	0.03

Solution

x 0 1 2 3 4 5 6 Total p(x)     0.1 0.18 0.2 0.22 0.2 0.07 0.03 1 CDF(x) P(X