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      Question

      The probability of selecting a rotten apple

      randomly from a heap of 50 apples is 0.80. What is the number of rotten apples in the heap?
      A 42 Correct Answer Incorrect Answer
      B 48 Correct Answer Incorrect Answer
      C 40 Correct Answer Incorrect Answer
      D 52 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total number of apples in the heap = n(S) = 50
      Let E be the event of selecting a rotten apple from the heap.
      Number of outcomes favourable to E = n(E)
      P(E) = n(E)/n(S)
      0.80 = n(E)/50
      ⇒ n(E) = 50 × 0.80
      ⇒ n(E) = 40
      Therefore, the number of rotten apples in the heap = 42

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