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Combination of random variables - S3

I'm so confused..
Why do you square the constant before the Var in the first case and you just times by the constant in the second case?

I know I'm missing a key thing.. Help :3
(edited 8 years ago)
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Reply 1
Avatar for Zacken
Zacken
22
Original post by RK1998
I'm so confused..
Why do you square the constant before the Var in the first case and you just times by the constant in the second case?

I've done this chapter back in October and it was perfectly fine, now that I'm tryna revise I think I'm missing a key thing.. Help :3


It's something you should have learnt in S1! Var(aX)=a2Var(X)\text{Var}(aX) = a^2 \text{Var}(X)
Reply 2
Avatar for RK1998
RK1998
OP
5
Original post by Zacken
It's something you should have learnt in S1! Var(aX)=a2Var(X)\text{Var}(aX) = a^2 \text{Var}(X)


That's the one! Got it! Thank you so much :smile:

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