Find the variance of 2x, 2x-1 and 2x+1
-
A.
2/3 -
B.
2 -
C.
√(2/3) -
D.
1
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})
(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})