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Activity E has these estimates for duration: Optimistic = 91 days, Most likely = 100 days, pessimistic = 115 days. What is the estimated standard

Activity E has these estimates for duration: Optimistic = 91 days, Most likely = 100 days, pessimistic = 115 days. What is the estimated standard deviation for activity E?

a. 1

b. 2

c. 4

d, 16

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