Mathematics · important
Mean deviation about mean for JEE
Calculation of standard deviation, variance and mean deviation for grouped and ungrouped data
Formula
\(\text{MD}_{\bar{x}}=\frac{1}{N}\sum f_i|x_i-\bar{x}|\)
Variables: \(\bar{x}\): arithmetic mean, \(x_i\): values/class marks, \(f_i\): frequencies, \(N=\sum f_i\).
Conditions: For ungrouped data take all \(f_i=1\).
Standard mean deviation computation.