How To Calculate Standard Deviation?

To calculate standard deviation:

1. Find the average (mean) of all the data values. This is called the mean, μ.
2. For each data point, subtract the mean from the data value. This is called the deviation.
3. Square each deviation to make it positive.
4. Add up all the squared deviations.
5. Divide the sum by one less than the number of data values.
6. Take the square root of the result. The result is the standard deviation, σ.

The standard deviation measures how widely spread out the values are from the average. A low standard deviation indicates the data points tend to be very close to the mean; a high standard deviation indicates the data points are spread out over a wider range of values.

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