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1. Find the mean (average) of each set.

2. Subtract each value from its set mean.

3. Square each difference.

4. Add the squared values for each set.

The sum of the squared differences for each set is that set's variance. If you want to find standard deviation (a much more useful number in most cases), divide the variance by the number of values in the set minus 1 (n-1), and then take the square root of the result.

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Q: How do you find variance of 2 sets of numbers?
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