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WAEC Further Mathematics 2022 Question 28

Question 28

Statistics

The mean heights of three groups of students consisting of 20, 16 and 14 students each are 1.67 m, 1.50 m and 1.40 m respectively. Find the mean height of all the students.

  1. A.1.63 m
  2. B.1.54 m
  3. C.1.52 m
  4. D.1.42 m
Show the answer and explanation

Answer: B (1.54 m)

Explanation

Total height = 20(1.67) + 16(1.50) + 14(1.40) = 33.4 + 24 + 19.6 = 77; 77 ÷ 50 = 1.54 m.