Mathematics · supplementary
Quartiles for ungrouped data for JEE
Measures of dispersion; calculation of mean, median, mode of grouped and ungrouped data
Formula
\(Q_1=\text{value of }\left(\frac{n+1}{4}\right)\text{th item},\quad Q_3=\text{value of }\left(\frac{3(n+1)}{4}\right)\text{th item}\)
Variables: \(n\): number of ordered observations.
Conditions: Data arranged in order; interpolation may be used if needed.
Quartile deviation and box-type summaries.