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WAEC Further Mathematics 2016 Question 32

Question 32

Statistics

Find the vaiance of 11, 12, 13, 14 and 15.

  1. A.2
  2. B.3
  3. C.2√3
  4. D.10√2
Show the answer and explanation

Answer: A (2)

Explanation

Mean 13; squared deviations 4, 1, 0, 1, 4 add to 10. Variance = 10/5 = 2.