.The number of major software failures of an update to the PearOS ranges from 0 to 5 and has the following probability distribution, where p(x) is the probability mass function, and F(x) is the cumulative distribution. x 0 1 2 3 4 5 p(x) .20 a .21 .15 .11 .02 F(x) .20 .51 b .87 .98 1 a. If p is the probability mass function for x, then evaluate a. b. If F is the cumulative distribution function of x, then what is the value of b