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Railways NTPC (Technical Ability) Tool Engineering Question Bank Tool Engineering

  • question_answer
    The product is assembled from parts A and B. The probability of defective parts A and B are 0.1 and 0.2 respectively. Then the probability of the assembly of A and B to be non-defective is:

    A) 0.7                               

    B) 0.72

    C) 0.8                               

    D) 0.85

    Correct Answer: B

    Solution :

    P (A) to be non-defective \[=1-0.1=0.9\] P (B) to be non-defective \[=1-0.2=0.8\] P (AB) to be non-defective \[=P(A)\times P(B)\]                                     \[=0.9\times 0.8=0.72\]


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