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Please please give me upvote ud83dude4f I always there with you       Expected time = ( Optimistic time + 4* Most Probable + Pessimistic time ) / 6   Variance = (S.D.)2 and S.D. (Standard deviation) = ( Pessimistic time - Optimistic time) / 6   Critical path is B- E- H- J with expected duration is 26 weeks (4+10+7+5) with variance 4.11 or S.D. 2.03   The project time(say X) follows normal distribution with mean 26 weeks and standard deviation 2.03, and the Standard normal variable Z = (X-26)/2.03   Therefore Prob.(25) = Prob. (Z=.49261) hence Probability the project get completed within 25 weeks is .311   Similarly Prob.(30) = Prob. (Z= 1.97) hence Probability the project get completed within 30 weeks is .975 ...