📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!
  • google app store apple app store
    • âś–

      Question

      23 defective pens are accidentally mixed with 140

      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 0.860 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 = 140 + 23 = 163 pens
      P(E) = (Number of favourable outcomes) / (Total number of outcomes)
      P(picking a good pen) = 140/163 = 0.858

      Practice Next
      More Probability Questions
      ask-question