The expected value for the estimation variable (size), S, can be computed as a weighted average of the optimistic(Sopt), most likely (Sm), and pessimistic (Spess) estimates given as

A. EV = (Sopt + 4Sm + Spess)/4

B. EV = (Sopt + 4Sm + Spess)/6

C. EV = (Sopt + 2Sm + Spess)/6

D. EV = (Sopt + 2Sm + Spess)/4

Answer: Option B