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Let X X and X represent the times necessary to perform three successive repair tasks...

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Let X X and X represent the times necessary to perform three successive repair tasks at a certain service facility Suppose they are independent normal rv s with expected values and y and variances and e respectively Round your answers to four decimal places LAUSE SALT a 50 and 15 calculate P7 170 and P 120 ST S 170 P T 170 P120 s T s 170 b Using the s and es given in part a calculate both P 45 s X and P 48 s X s 52 P 45 X P 48 sxs 32 c Using the w s and e s given in part a calculate P 10 s X 0 5X 0 5X 5 P 10 sx 0 5 0 5X 55

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