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Standard deviation helps you identify the relative level of variation from the mean or equation approximating the relationship in the data set. In a normal distribution

1 standard deviation left or right of the mean = 68.2% of the data

2 standard deviations left or right of the mean = 95.4% of the data

3 standard deviations left or right of the mean = 99.6% of the data

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Q: What does standard deviation help you find?
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