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JAMB Mathematics 1991 Question 49

Question 49

Measures of Central Tendency

Use the following information to answer questions 48 and 49.
Fifty boxes each of 50 bolts were inspected for the number which were defective. The following was the result
No. of defective per box: 4, 5, 6, 7, 8, 9
No. of boxes: 2, 7, 17, 10, 8, 6
Find the percentage of boxes containing at least 5 defective each.

  1. A.96
  2. B.94
  3. C.92
  4. D.90
Show the answer and explanation

Answer: A (96)

Explanation

Only 2 boxes have fewer than 5 defective, so 48 of the 50 boxes have at least 5. 48/50 × 100 = 96%.