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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: ivan kitaev • 2 years ago Are you serious? must be considered first with multiplication!Eugene Tkachenko

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