AP ICET 2017 Shift 2 Paper

Question : 144 of 200

Marks: +1, -0

σ

is the standard deviation of

x_i(i=1,2,..............n)

then the variance of

5x_i+3(i=1,2,...........,n)

Solution:

S.D of xi = σS.D. of

(5x_i+3)=5σ

∴ Variance of (

5x_i+3)=(5σ)^2=25σ^2

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