GCSE Maths Coursework Watch

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Can somebody please help me. I am doing my maths coursework on mayfield high school and am copairing IQ and KS2 results in boys and girls. In order to get a good grade i have to include standard deviation but i haven't a clue what this is. I asked my teacher but she told me that i should already know what it is but i don't.
I would be very greatful if anybody could tell me what standard deviation is and how to do it. Thanks

Laura Q.
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