Question

Var(5x+2) is
(a) 25 var (x)
(b) 5 var (x)
(c) 2 var (x)
(d) 25

Answer 1

I think the answer is (b)5 var (x)

Answer 2

Hi ,

A discrete random variable X , the

variance of X is written as Var( X ).

*****************************************
Var( aX + b ) = a² Var( X )

******************************************

Now ,

According to the problem given ,

Var( 5x + 2 )

= 5² Var( x )

= 25 Var( x )

Option ( a ) is correct.

I hope this helps you.

: )