Question

Var (4x + 7) is _________
Fill in the blank.

Answer 1

28x is the correct answer

Answer 2

Hi ,

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For a discrete random variable X ,

the variance of X is written as Var(X).

Var ( aX + b ) = a² Var( X )

Where a and b are both constants .

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Now ,

Var ( 4x + 7 ) = 4² Var( x )

= 16 Var( x )

I hope this helps you.

: )