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WAEC Further Mathematics 2012 Question 19

Question 19

Statistics

The marks obtained by 10 students in a test are as follows: 3, 7, 6, 2, 8, 5, 9, 1, 4 & 10. Find the variance

  1. A.8.25
  2. B.8.50
  3. C.9.00
  4. D.9.17
Show the answer and explanation

Answer: A (8.25)

Explanation

With mean 5.5 the squared deviations add up to 82.5, so the variance is 82.5 ÷ 10 = 8.25.