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WAEC Further Mathematics 2023 Question 29

Question 29

Statistics

Adu's scores in five subjects in an examination are 85, 84, 83, 86 and 87. Calculate the standard deviation.

  1. A.1.4
  2. B.1.6
  3. C.1.8
  4. D.2.0
Show the answer and explanation

Answer: A (1.4)

Explanation

Mean = 85. Squared deviations 0, 1, 4, 1, 4 add to 10. SD = √(10/5) = √2 ≈ 1.4.