How to calculate the analytical balance print reports

N= number of Weight

X^- = average of weight

SD = standard deviation

Srel = relative Standard Deviation

Ex =Total weight

Min = Minimum Value

Max = Maximum Value

Diff = Difference

X1 = first weight 

X2 =  second weight

Example :

X1 =137

X2 = 256

 N=2

X^- = 137 + 256 = 393/2 = 196.5

SD = √(X₁-X^-)² + (X₂-X^-)²………………………/ N-1

SD = Amount of variation close to mean.

SD = (137-196.5)² + (256-196.5)²/2-1 (-59.5)²+(59.5)²

59.5 x 59.5 + 59.5 x 59.5

3540.25 + 3540.25 √7080.5

=84.1

Ersl = related standard Deviation %

• Relative standard deviation  is also called Coefficient of variation (CV).
• Is also called Imprecision. 
• Is measure the amount of variablity relative to mean.
• It is calculated as follows.

RSD  %= standard Deviation (SD)  / Mean  X 100

=84.1/196.5 X 100 = 42.79%