1. The problem statement, all variables and given/known data A random sample of size n = 81 is taken from an infinite population with the mean μ = 128 and the standard deviation σ = 6.3. With what probability can we assert that the value we obtain for the sample mean X will fall between 126.6 and 129.4? 3. The attempt at a solution z = (x-μ)/(σ/sqrt(n)) so we have z = (126.6-128)/(6.3/9) = -2 and z = (129.4-128)/(6.3/9) = 2 so the probability it will fall in the range is F(2) - F(-2) = .9772 - .0228 = .9544 is this correct?