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Standard deviation (σ) calculator with mean value & variance online.

Enter data values delimited with commas (e.g: 3,2,9,4) or spaces (e.g: 3 2 9 4) and press the *Calculate* button.

Enter probability or weight and data number in each row:

Population mean:

Population standard deviation:

Sample mean:

Sample standard deviation:

Random variable mean:

Discrete random variable standard deviation:

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Users write Now: BluCari • 10 months ago • edited I understood why the calculator gives 2 + 2x2 8 in the example because it counts 2 + 2 first and then only 4x2, as it were, the first 2 + 2 example solves first and then the other does the answer and it turns out 8 I know it's obvious, but some don't.

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