7.1 Suppose the mean cost and mean schedule of a program is 100 ($M) and 48 months, respectively. Furthermore, suppose the program's cost and schedule variances are 625 (months)2 and 36 (months)2, respectively. If the correlation between the program's cost and schedule is 0.5, find x1 such that a. P(Cost x1 | x2 = 53 months) = 0.95 if program cost and schedule have a bivariate normal distribution b. P(Cost x1 | x2 = 53 months) = 0.95 if program cost and schedule have a bivariate normal-lognormal distribution c. P(Cost x1 | x2 = 53 months) = 0.95 if program cost and schedule have a bivariate lognormal distribution