Mathematics

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

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})