Question: In the calculation of variance for optimistic and pessimistic activity duration estimates made at the 95 or 90 percent level, the denominator of the fraction

In the calculation of variance for optimistic and pessimistic activity duration estimates made at the 95 or 90 percent level, the denominator of the fraction that approximates the standard deviation of the time distribution changes from the traditional (b – a)/6 to (b – a)/3.3 for 95 percent and to (b – a)/2.6 for 90 percent. Where did the 3.3 and the 2.6 come from?

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The 33 corresponding to 95 percent is based on a zvalue of 1645 which has 5 ... View full answer

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