Question

Var (12x) is _____________
Fill in the blank.

Answer 1

According to properties of Variance,
If all values are scaled by a constant, the variance is scaled by the square of that constant : $\bold{Var(ax)=a^2Var(x)}$
Here Var(ax) indicates variance of a random variable of ax
Var(x) indicates variance of a random variable of x .

So, Var(12x) = 12²Var(x) = 144Var(x)