19. Two investment alternatives are being considered. The data below have been estimated by a panel of experts, and all cash flows are assumed to be independent. Life is not a variable. Alternative A Alternative B Std. Std. Expected Deviation Expected Deviation End of Cash of Cash Cash of Cash Year Flow Flow Flow Flow --$8,000 $0 -$12,000 $500 4,000 600 4,500 300 6,000 600 4,500 300 4,000 800 4,500 300 6,000 800 4,500 300 AWNO With MARR = 15% per year, determine the mean and standard deviation of the incremental PW [i.e., A(B - A)]. (12.5)