(sum/n-1) Standard deviation (Square root of variance) Example of standard deviation calculation for the three 5 ml trials. Sample ID 5 ml pipetted water sample Measured Deviation Trial 1 Trial 2 Trial 3 Average Sum of squares Variance Standard deviation mass 6000 5400 3500 4967 1033 433 -1467 Deviation squared 1067089 187489 2152089 3406667 1703333 1305

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