how do you answer this one? answer one question

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(Question B1 continued) |4917661 H 51 1 671 1621 37 3712 49 |49|1867 0 16 16 A 0 0 16 16 037 371 049 49 0167 000 Start 000 36 3167 0 1717 B 0017 |17|10|27| D 17 0 27 27 936 E 27 0 36 1670 167 Finish 1670 167 36 0 67 lm Activity A B D E F G H 1 Variance of 0 0 1 5 3 0 8 16 0 Activity Durations c) Identify the critical path(s) with the help of the network diagram given above. Calculate the mean and the standard deviation of the project duration. (15% marks) d) What is the probability that the project will finish within 70 weeks? (10% marks) e) Calculate the probability of finishing activities on subcritical path A->C->G->H within 70 weeks. Compare this result with your calculations in part (d). What did you observe? Please comment on it by referring to properties of PERT. (15% marks)