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As we have seen, every list of numbers has an average. Also as we have seen, the numbers of the list do not need to actually be anywhere near the actual average. In fact, most numbers in the list differ, or deviate from the average by some degree.
The standard deviation tells us generally how the numbers will deviate from the average. The greater the deviation, the higher the standard deviation.
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800Score Tip:
While this chapter explores the intricate Standard Deviation formula, the GRE does not require you to know it. Your goal in learning Standard Deviation should be to understand what it is, how it works, and what it represents, rather than how to calculate its value.
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Formula:
This is a partial free sample of our prep guide. To view the remainder of this page, purchase the 800score.com Prep Course.
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