(b) Fill out the table below with the appropriate values. (round three decimal places) x P(x) x•P(x) (x - (x - P(x) μ)2 μ)2 • Let x1 and x2 be random variables representing the lengths of time in minutes to examine a computer (x1) and to repair a computer (x2). Long-term history has shown: Examine computer, x1 : µ1 = 28.1 minutes; = 8.2 minutes σ1 Repair computer, x2 : µ2 = 90.5 minutes; = 15.2 minutes σ2 Let W = x1 + x2, representing the total time to examine and repair. Compute for W: µw = _______________ = _______________ iii) = _______________ σw
(b) Fill out the table below with the appropriate values. (round three decimal places) x P(x) x•P(x) (x - μ)2 (x - μ)2 • P(x) Let x1 and x2 be random variables representing the lengths of time in minutes to examine a computer (x1) and to repair a computer (x2). Long-term history has shown: Examine computer, x1 : µ1 = 28.1 minutes; σ1 = 8.2 minutes Repair computer, x2 : µ2 = 90.5 minutes; σ2 = 15.2 minutes Let W = x1 + x2, representing the total time to examine and repair. Compute for W: µw = _______________ = _______________ iii) σw = _______________
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