WAEC Further Mathematics 2023 Objective — Question 36

Question 36 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2023 Objective paper, with the correct answer and a full explanation.

The scores of some students in a class test are 4, 6, 1, 8, 9, 5 and 2. Calculate, correct to one decimal place, the mean deviation of their scores.

A. 2.3Correct
B. 2.7
C. 5.0
D. 5.2

Explanation

Ordering the scores: 1,2,4,5,6,8,9. Mean = (1+2+4+5+6+8+9)/7 = 35/7 = 5. Mean deviation = sum of |x - mean| / n = (4+3+1+0+1+3+4)/7 = 16/7 = 2.2857, approximately 2.3.

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