How to calculate variance step by step? Step 1. Calculate the mean of the given numbers. Step 2. Then for each number, subtract the mean and find the square of the difference. Step 3.

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To calculate the variance, you first subtract the mean from each number and then square the results to find the squared differences. You then find the average of those squared differences. The result is the variance. The

Find the mean of the data set. Add all data values and divide by the sample

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