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- Finding the median and quartiles for grouped data

Published: *31/08/2016*

KS4

2 pages

KS4

2 pages

A clear description of how to find the median and quartiles of grouped data.

The median for grouped data can be found either by interpolation or by using a formula.

The formula is

Median =LB+w((1/2 n-∑ f_b)/f_m )

where

LB is the lower boundary or limit of the class containing the median

w is the width of the median class interval

n is the total frequency, or the number of values

∑ f_b is the number of values below LB

f_m is the number of values containing the median

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Scott SherwoodPosted on 28th October 2016