Mathematics · important
Mean deviation about a value for ungrouped data for JEE
Calculation of standard deviation, variance and mean deviation for grouped and ungrouped data
Formula
\(\text{MD about }a=\frac{1}{n}\sum_{i=1}^{n}|x_i-a|\)
Variables: \(x_i\): observations, \(a\): chosen central value, \(n\): number of observations.
Conditions: Usually \(a\) is mean or median.
Average absolute deviation in raw data.