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WAEC Further Mathematics 2025 Question 18

Question 18

Statistics

Calculate the standard deviation of 2, 7, 10, 11, 16 and 20

  1. A.5.83
  2. B.4.76
  3. C.3.87
  4. D.2.75
Show the answer and explanation

Answer: A (5.83)

Explanation

Mean = 66/6 = 11. Squared deviations: 81, 16, 1, 0, 25, 81, total 204. SD = √(204/6) = √34 ≈ 5.83.