Given data points are #28, 30, 29, 26, 31# and #30#, find standard deviation step by step?
Standard Deviation is
Arithmetic Mean is simply sum of all data points divided by their number and as here data points are
Deviations from mean are values of data points minus arithmetc mean and here they are
Squares of the deviations are
As variance is average of square of the deviations , variance is
and Standard Deviation is square root of variance i.e.