The expected activity time in PERT analysis is calculated$$ as:

Part $2$

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 sum of the activity$$ variances, divided by six.

E$.$

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