S2 E(X) Var(X) Proofs?

are S2 E(X) Var(X) Proofs required for the Edexcel exam?

are S2 E(X) Var(X) Proofs required for the Edexcel exam?

Yes? You'll need to be more specific.

Yes? You'll need to be more specific.

Do you need to learn/learn how to derive this
https://postimg.org/image/lrnvcgrtz

Do you need to learn/learn how to derive this
https://postimg.org/image/lrnvcgrtz

To quote the book: "you should be able to derive it from first principles."

So yes.

Do you need to learn/learn how to derive this
https://postimg.org/image/lrnvcgrtz

Yeah, think so. It's just using a formula provided in your formula booklet.

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