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# S2 E(X) Var(X) Proofs? Watch

1. are S2 E(X) Var(X) Proofs required for the Edexcel exam?
2. (Original post by fpmaniac)
are S2 E(X) Var(X) Proofs required for the Edexcel exam?
Yes? You'll need to be more specific.
3. (Original post by Zacken)
Yes? You'll need to be more specific.
Do you need to learn/learn how to derive this
https://postimg.org/image/lrnvcgrtz
4. (Original post by fpmaniac)
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.
5. (Original post by fpmaniac)
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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