The table shows the probability distribution of the number of days (x) to complete a construction project by a contractor.   x f(x) 1 0.104 2   3 0.312 4 0.240 5 0.098 6 0.017   13 If you doubled each number of days to completion in the Days (x) column, the variance of days to completion will be _________.   a 5.710               b 4.758               c 3.965               d 2.855

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