How to find standard deviation??? Nothing I can find makes sense.

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Rooster Cogburn Profile
Rooster Cogburn , Rooster Cogburn, answered

    To calculate the standard deviation of those numbers:

    1. Work out the Mean (the simple average of the numbers)
    2. Then for each number: Subtract the Mean and square the result.
    3. Then work out the mean of those squared differences.
    4. Take the square root of that and we are done!

    Standard Deviation Formulas - Math is Fun


Tom Jackson Profile
Tom Jackson answered

Getting a better "feel" for what the "standard deviation" is may help.

Here's a good site: www.robertniles.com/stats/stdev.shtml

The standard deviation is kind of the "mean of the mean," and often can help you find the story behind the data. To understand this concept, it can help to learn about what statisticians call "normal distribution" of data.

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