ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    Question

    18 defective pens are accidentally mixed with 132

    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 0.906 Correct Answer Incorrect Answer
    B 0.880 Correct Answer Incorrect Answer
    C 0.875 Correct Answer Incorrect Answer
    D 0.884 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 = 132 + 18 = 150 pens
    P(E) = (Number of favourable outcomes) / (Total number of outcomes)
    P(picking a good pen) = 132/150 = 0.880

    Practice Next
    More Probability Questions
    ask-question