This standard deviation calculator calculates the standard deviation and variance from a data set. In addition, you’ll also be able to see your answer step-by-step below.

Data set:

**Results**

- Variance:
- Standard Deviation:

**Explanation**

- First, I summed all the numbers:

- I squared the sum, and divided the number of items in the data set
- I took my set of original numbers from step 1, squared them individually this time, and added them all up:

- I subtracted the amount in step 2 from the amount in step 3:

- I subtracted 1 from the number of items in my data set:

- I divided the number in step 4 by the number in step 5:

- Finally, I took the square root of the number from step 6 (called the Variance),

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Very helpful to me.

I love whoever designed this website and this calculator. It’s more useful than going to class.