In a PERT network, the activity durations are given as to (optimistic), tp (pessimistic) and tm (most likely time). What is the variance of is activity ?

1. 

In a PERT network, the activity durations are given as to (optimistic), tp (pessimistic) and tm (most likely time). What is the variance of is activity ?
[A]. 61-1564-1
[B]. 61-1564-2
[C]. 61-1564-3
[D]. None of the above

Answer: Option C

Explanation:

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