Normal Distribution OCR MEI 2021 | Revision Server | Page 1

daring sphinx Apr 30, 2025, 3:38 PM

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Whats E(a+bX) in terms of E(X)?

weary nimbus Apr 30, 2025, 3:39 PM

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E(A) + BE(X)?

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i dont get how we introduce all the E(X) stuff

daring sphinx Apr 30, 2025, 3:40 PM

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Is this further or regular

weary nimbus Apr 30, 2025, 3:40 PM

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regular

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could you quickly call me and explain?

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the markscheme says this

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its so vague though

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like how they got that

daring sphinx Apr 30, 2025, 3:42 PM

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Because the standard deviation will be multiplied by b after the transformation

weary nimbus Apr 30, 2025, 3:43 PM

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for what part?

daring sphinx Apr 30, 2025, 3:43 PM

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Does ur spec cover expectation algebra

weary nimbus Apr 30, 2025, 3:43 PM

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we've barely done it bro icl

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infact yeah pr much never

daring sphinx Apr 30, 2025, 3:43 PM

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One sec

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Ye u gotta know it

weary nimbus Apr 30, 2025, 3:46 PM

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shiit

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my teacher has never taught that

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shes never taught our examboard before though so

daring sphinx Apr 30, 2025, 3:46 PM

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E(a+bX) = a+bE(X)
And Var(bX) = b^2Var(X)

weary nimbus Apr 30, 2025, 3:46 PM

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what is this actually telling us though

#Normal Distribution OCR MEI 2021