What do you mean by standard deviation of the data set?

 

a.   Standard Deviation

Standard deviation is a measure of dispersion of data values from the mean. The formula for standard deviation is the square root of the sum of squared differences from the mean divided by the size of the data set.

For a Population

σ= √∑ni=1(xi−μ)2n√σ=∑i=1n(xi−μ)2n

For a Sample

s= √∑ni=1(xi−x¯¯¯)2n−1