The table shows the probability distribution of the number of days (x) to complete a construction project by a contractor. X f(x) 0.117 0.312 0.227 0.088 0.014 3 The probability that the project will be finished in 2 days is 0.200 0.213 0.227 0.242 4 Ef ( x) = a 1.04 1.02 1.00 0.98 5 The probability that it will take more than 2 days to complete the project is 0.641 0.616 0.592 0.569 The probability that it will take at most 2 days to complete the project is 0.377 0.359 0.342 0.326 7 The expected value of the days to finish the project is 2.546 2.680 2.821 2.969 8 The variance of the days to complete the project is 1.414 1.309 1.212 1.123 9 The standard deviation of the days to complete the project is a 1.387 1.284 1.189