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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: Danil Polyakhov • 8 months ago - God, no one reads the instructions ... EVEN, especially for stupid ones, there is a paragraph why 2 + 2 * 2 displays 8 ..... You don’t even need to count, just typed and EVERYTHING! But no, give them the order of actions, they are completely stupefied already!

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