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14 March, 17:47

About ___% of children score within one standard deviation above or below the national average in intelligence.

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  1. 14 March, 18:02
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    The question is not influenced by the fact that it's about intelligence - standard deviation is a way of describing data and it's the same for all kinds of data.

    So in general, one standard deviation away from the mean in both directions encompases around 66% of the cases - so here it would be 66% of children.

    Additionally, 95% of all children should lie withing two standard deviations - so two standard deviations below or above the average.
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