1. For the network shown here, calculate the following: a. Mean duration (p) = 45.83 Days b. Variance (Op ) = 9.028 Days C. Standard Deviation (op) = 3.005 Days d. Probability that the network can be completed in 50 days or less. 91.73% A C F E EST EFT Activity TE Duration [in days) ACTIVITY OFT NORMAL PESS TE IST ITT A Var 12 17 15 25 C 25 30 D 20 E 15 20 30 10 15