πŸ“’ Too many exams? Don’t know which one suits you best? Book Your Free Expert πŸ‘‰ call Now!


    Question

    24 defective pens are accidentally mixed with 120

    good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen is taken out is a good one.
    A 0.865 Correct Answer Incorrect Answer
    B 0.870 Correct Answer Incorrect Answer
    C 0.833 Correct Answer Incorrect Answer
    D 0.858 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Numbers of pens = Numbers of defective pens + Numbers of good pens
    ∴ Total number of pens = 120 + 24 = 144 pens
    P(E) = (Number of favourable outcomes) / (Total number of outcomes)
    P(picking a good pen) = 120/144 = 0.833

    Practice Next
    ask-question