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Find the variance of 2x, 2x-1 and 2x+1

Mathematics
JAMB 2006

Find the variance of 2x, 2x-1 and 2x+1

  • A. 2/3
  • B. 2
  • C. √(2/3)
  • D. 1
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Correct Answer: Option A
Explanation

\(\sum x = 6x\)
\(\sum(x-\bar{x})^2\) = 2
\(\bar{x} = \frac{\sum x}{n}\)
= \(\frac{6x}{3}\)
= 2x
Variance = \(\frac{\sum(x-\bar{x})^2}{n}\)
= \(\frac{2}{3}\)

There is an explanation video available below.


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Explanation Video

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