28. Let X1, X2, and X3 represent the times necessary to perform three successive repair tasks at a service facility. Suppose they are independent, normal rv's with expected values l1, µ2, and µ3 and var- iances of, ož, and oz, respectively. а. If and o = 3: Hi = µ2 = µ3 = 60 o = 15, calculate P(X1 + X2 + X3 < 200). What is P(150 < X1 + X2 + X3 < 200)? b. Using the u;'s and o;'s given in part (a), calcu- late P(55 < X) and P(58 2X3). 여= 10, calculate P(X1 +

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