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WAEC Mathematics 1995 Question 47

Question 47

Measures of Central Tendency

The mean of 20 observations in an experiment is 4. If the observed largest value is 23, find the mean of the remaining observations.

  1. A.4
  2. B.3
  3. C.2.85
  4. D.2.60
  5. E.2.56.
Show the answer and explanation

Answer: B (3)

Explanation

Total = 20 × 4 = 80. Removing 23 leaves 57 for 19 observations, so the mean is 57 ÷ 19 = 3.