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WAEC Mathematics 2010 Question 38

Question 38

Measures of Central Tendency

The mean age of R men in a club is 50 years. Two men, aged 55 and 63, left the club and the mean age reduced by 1 year. Find the value of R.

  1. A.18
  2. B.20
  3. C.22
  4. D.28
Show the answer and explanation

Answer: B (20)

Explanation

50R − 118 = 49(R − 2), so 50R − 118 = 49R − 98 and R = 20.