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WAEC Further Mathematics 2018 Question 28

Question 28

Statistics

Calculate the standard deviation of 30, 29, 25, 28, 32 and 24.

  1. A.2.0
  2. B.2.8
  3. C.3.0
  4. D.3.2
Show the answer and explanation

Answer: B (2.8)

Explanation

Mean = 168/6 = 28. Squared deviations 4, 1, 9, 0, 16, 16 add to 46. SD = √(46/6) ≈ 2.8.