The formula for the variance of the duration of an activity is ______.

a. the square root of [1/6(b – a)]
b. [1/6(a – b)] raised to the power of 2
c. [1/6(b – a)] raised to the power of 2
d. the square root of [1/6(a – b)]


c. [1/6(b – a)] raised to the power of 2

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