Standard Deviation Example Statistics. Its symbol is σ the greek letter sigma the formula is easy. Calculate the mean of your data set.
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But hang on. The empirical rule says that 68 of heights fall within 1 time the sd of mean or x 1 σ 394 1 147 247 541. Deviation just means how far from the normal.
So now you ask what is the variance variance.
The average of these squares is 32 41 variance. Adding these up the sum is 20. But hang on. The mean of the data is 1 2 2 4 6 5 15 5 3.
