A-Level Maths: L4-04 [Data: Cleaning Data Example]

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Would you be expected to know the standard deviation formula if a question like this popped up in an exam?

dylanpi
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what would this answer for OCR MEI be? I am struggling with the Sxx formulae because I am unsure if you should just square the mean value in this case?

zoe
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The question I'm practicing doesn't give a number it just says "given that all 9 people are children clean the data and recalculate mean and SD" is there an age limit for a child I'm unaware of as this question is quite hard

LebronJames-viwi