An activity on a PERT network has these time estimates: optimistic = 2, most likely = 3, and pessimistic = 8. Its expected time and variance (if it is a critical activity) are
A) 3.67; 1
B) 3.67; 6
C) 4.33; 1
D) 4.33; 6
E) none of these

Question

Quizplus · Accepted Answer

The expected time (TE) for an activity in a PERT network is calculated using the formula TE = (Optimistic + 4*Most Likely + Pessimistic) / 6. Substituting the given values, TE = (2 + 4*3 + 8) / 6 = 3.67. The variance (V) is calculated using the formula V = [(Pessimistic - Optimistic) / 6]^2. Substituting the given values, V = [(8 - 2) / 6]^2 = 1.

An Activity on a PERT Network Has These Time Estimates