Question

10. b) a (a + 2) = b c) bb + 2) If 3 + i is a root of the equation x + ax + b =0 then a is a) 3 b)-3 c) 6 d) -6 Var Education and​

Answer 1

Answer:

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.