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JAMB Mathematics 2002 Question 48

Question 48

Measures of Central Tendency

The mean of a set of six numbers is 60. If the mean of the first five is 50, find the sixth number in the set

  1. A.105
  2. B.100
  3. C.95
  4. D.110
Show the answer and explanation

Answer: D (110)

Explanation

The six numbers total 6 × 60 = 360 and the first five total 5 × 50 = 250. The sixth is 360 − 250 = 110.