The expected activity time in PERT analysis is calculated as:

Select one:

A$.$ the simple average of the optimistic, pessimistic, and most likely times.

B$.$ the sum of the optimistic, pessimistic, and most likely times.

C$.$ the sum of the optimistic, pessimistic, and most likely times, divided by six.

D$.$ the weighted average of $a,m,$ and $b,$ with $m$ weighted $4$ times as heavily as a and $b.$