In a PERT chart, what is the formula for calculating the expected time (TE) of an activity?
- ATE = (Optimistic time + Pessimistic time) / 2
- BTE = (Most likely time × 3 + Pessimistic time) / 4
- CTE = (Optimistic time + 4 × Most likely time + Pessimistic time) / 6Correct
- DTE = (Optimistic time + Most likely time + Pessimistic time) / 3
Solution
Concept
PERT expected time
Formula
TE = (to + 4tm + tp)/6
Step-by-step solution
1. TE = (O + 4M + P)/6.
Explanation
PERT uses a beta distribution with weight 4 on the most likely time.
Why the other options are wrong
Other formulas are not PERT.
Shortcut
(O + 4M + P)/6.
Correct answer: C) TE = (Optimistic time + 4 × Most likely time + Pessimistic time) / 6