An activity on a PERT network has these time estimates: optimistic = 2, most likely = 3, and pessimistic = 10. What is its expected activity time and variance?
A) 4; 1.78
B) 4; 10.67
C) 5; 1.78
D) 5; 10.67
E) none of these

Question

Quizplus · Accepted Answer

The expected activity time (E) is calculated using the formula: E = (Optimistic + 4*Most Likely + Pessimistic) / 6 = (2 + 4*3 + 10) / 6 = 4. The variance (V) is calculated using the formula: V = [(Pessimistic - Optimistic) / 6]^2 = [(10 - 2) / 6]^2 = 1.78.

An Activity on a PERT Network Has These Time Estimates