Question on: JAMB Mathematics - 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 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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