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WAEC Mathematics 2022 Question 33

Question 33

Measures of Central Tendency

The mean of a set of 10 numbers is 56. If the mean of the first nine numbers is 55, find the 10th number.

  1. A.75
  2. B.65
  3. C.55
  4. D.45
Show the answer and explanation

Answer: B (65)

Explanation

Total of 10 numbers = 560 and of the first nine = 495. The 10th number = 560 − 495 = 65.