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Binomial Probability Theorem

PERT calculat...

Question

PERT calculations yield a project length of 70 weeks with a variance of 9 weeks. The number of weeks required to complete the project with a probability of 95 % (probability factor for 95 %= 1.647) is _______

A

76.94 weeks

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B

75.94 weeks

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C

74.94 weeks

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D

73.94 weeks

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Solution

The correct option is C 74.94 weeks
Std. deviation

$= \sqrt{Variance} = \sqrt{9} = 3$

$1.647 = \frac{T - 70}{3}$

$\Rightarrow T = 74.941 weeks$

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