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Find the variance of 2x 2x-1 and 2x 1 - JAMB Mathematics 2006 Question

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 Option: A

(\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})

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