I thought that Chebychev's inequality is what would be used to solve this question, but the(adsbygoogle = window.adsbygoogle || []).push({}); exceedinginstead of theor morethrows me off. Here is the question from Jim Pitman's book (I am studying for my final...)

Suppose the IQ scores of million individuals have a mean of 100 and a SD of 10.

Without making any further assumptions about the distribution of the scores, find an upper bound on the number of scores exceeding 130.

Thank You. No need for the answer, just I need to know whose inequality/theorem should I use. Though if someone can kindly explain Chebychev's theorem in detail, it would be awesome. He makes no sense.

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# Chebychev's Inequality

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