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    Question

    Probability machine A fails = 40% and machine B fails =

    50%. What is the probability plant will work when both machines work well?
    A 0.03 Correct Answer Incorrect Answer
    B 0.3 Correct Answer Incorrect Answer
    C 0.5 Correct Answer Incorrect Answer
    D 0.6 Correct Answer Incorrect Answer
    E 0.4 Correct Answer Incorrect Answer

    Solution

    Probability machine A fails = 40% Prob (A works) = 60% Probability machine B fails = 50%. Prob (B works) = 50% Prob both machines work well = 0.6*0.5 = 0.3

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