Suppose E(X) = 5 and Var(X) = 3.
FIND:
a) Var(2x+4)
___________MY ATTEMPT_____________
I used this formula from Wikipedia.
Var(ax+b) = Var(ax) = a^2Var(x)
Therefore,
2^2 Var(x) = 4*3 = 12
__________________________________
Someone told me the answer is 10, I dont know why.
Any tips
Thanks