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WAEC Further Mathematics 2013 Question 23

Question 23

Statistics

The sales of five sales girls on a certain day are as follows: GH¢26.00, GH¢39.00, GH¢33.00, GH¢25.00, GH¢37.00. Calculate the standard deviation if the mean sale is GH¢32.00.

  1. A.GH¢5.65
  2. B.GH¢5.66
  3. C.GH¢6.55
  4. D.GH¢6.56
Show the answer and explanation

Answer: B (GH¢5.66)

Explanation

Deviations −6, 7, 1, −7, 5; squares add to 160. SD = √(160/5) = √32 ≈ 5.66.