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What is standard deviation?

Asked by Kenward, Last updated: Dec 05, 2017

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a.Patricia

A.Patricia

Answered on Nov 14, 2017

The standard deviation is the approximate variation between the absolute middle of the data set (the median) and the highest and lowest numbers. This often sets a bell curve, which is what a lot of classes use now to grade on. The 100% (or whatever happens to be the highest) is the highest grade, so it’s set at the furthest right of the graph. The 0% (or lowest grade) sits at the furthest left. Everything else falls between those grades, plus or minus some from the median 50% (varies based on other grades).

The standard deviation has a bit of a complicated formula. It’s too complicated to go into here, but basically, it’s a square root of all the data put together in a convoluted way. A quick search online will yield the equation and what goes in each spot.

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