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I have to find $80\%$, $60\%$, $40\%$, $20\%$ and it's values of a range of scores.

For one range, my values go from $2$ to $8$ (mean will be $5$ which means, $50\%$ of that range's value = $5$)

For second range, my values go from $3$ to $15$ (mean will be $9$ which means, $50\%$ of that range's value = $9$)

How do I come up with some formula to find $\%$ and values at $80\%$, $60\%$, $40\%$, $20\%$ and make it dynamic (I can plug in any range and it would give me values at those $\%$)

Thank you

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    Oh you are right...median not mean. 50th % is median...2012-08-23

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