Mathematics · essential
Standard deviation for frequency distribution for JEE
Calculation of standard deviation, variance and mean deviation for grouped and ungrouped data
Formula
\(\sigma=\sqrt{\frac{1}{N}\sum f_i(x_i-\bar{x})^2}\)
Variables: \(x_i\): values or class marks, \(f_i\): frequencies, \(N=\sum f_i\).
Standard deviation of discrete/grouped data.