Let X1, X2, and X3 represent the times necessary to perform three successive repair tasks at a certain service facility. Suppose they are independent normal random variables with expected values μ1 = μ2 = μ3 = 65 and variances σ1^2 = σ2^2 = σ3^2 = 20 respectively. What is the value of E[X1 + X2 + X3]?
20
40
60
80
195
260