Why is the answer for part i) like that? How did they derive Var (X1-X2) = Var (

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junior college 2 | H2 Maths
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junior college 2 H2 Maths

Why is the answer for part i) like that? How did they derive Var (X1-X2) = Var (X1) + Var (X2) ?

Date Posted: 5 years ago

Jiayang

5 years ago

For JC i don't think the derivation is part of your syllabus.

But it's a "formula" you should know.

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Date Posted: 5 years ago