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The variance of the scores 1, 2, 3, 4, 5 is

Mathematics
JAMB 1995

The variance of the scores 1, 2, 3, 4, 5 is

  • A. 1, 2
  • B. 1, 4
  • C. 2.0
  • D. 3.0
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Correct Answer: Option C
Explanation
\(x\) 1 2 3 4 5 sum =15
\(x - \bar{x}\) -2 -1 0 1 2  
\((x - \bar{x})^{2}\) 4 1 0 1 4 10

Mean = \(\frac{15}{5} = 3\)

\(Variance = \frac{\sum (x - \bar{x})^{2}}{n}\)

= \(\frac{10}{5}\)

= \(2.0\)

 


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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