WAEC Further Mathematics 2025 Objective — Question 18
Question 18 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2025 Objective paper, with the correct answer and a full explanation.
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Calculate the standard deviation of 2, 7, 10, 11, 16, and 20.
- A. 5.83Correct
- B. 4.76
- C. 3.87
- D. 2.75
Explanation
Mean = 11. Sum of squared deviations = 81+16+1+0+25+81 = 204. Variance = 204/6 = 34. Standard deviation = √34 ≈ 5.83.
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