Lower Quartile Formula For Grouped Data. The formula for quartiles is given by. Interquartile range q3 q1.
For discrete frequency distribution the formula for ith quartile is. Middle quartile q2 n 1 2 4. Quartile formula for grouped data.
What it basically means is that in a data set with n data points.
Calculation of quartile q1 can be done as follows q1 n 1 th term. Where n is total number of observations. Interquartile range q3 q1. There are two methods of calculating quartiles lower quartiles middle quartiles and upper quartiles for grouped data which are the formula method and th.
