Normal Distribution | A-level Maths | OCR, AQA, Edexcel

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Normal Distribution in a Snap!

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What do I do if the question has an X1 and and X2 involved

lisa
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In example two why is sigma 20
Isn’t it supposed to be 400

faizahbegum
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my teacher told me that you aren't allowed to bring a calculator that solves the normal distribution in the exams, you need to find it yourself using the table given in the formula booklet ://

dearlantsov