Finding the median and quartiles for grouped data
A clear description of how to find the median and quartiles of grouped data.
Median for 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
Median for 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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Review this resource28/10/2016