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JAMB Mathematics 2013 Question 45

Question 45

Measures of Dispersion

If the variance of 3 + x, 6, 4, x, and 7 − x is 4 and the mean is 5, find the standard deviation.

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

Answer: D (2)

Explanation

The standard deviation is the square root of the variance: √4 = 2.