Arrange the grouped data in ascending order of class intervals
Find the total frequency, N
Calculate N/2
Determine the median class, which is the class interval whose cumulative frequency first exceeds N/2
Use the formula: Median = L + [(N/2 – cf) / f] × h
L = lower boundary of the median class
cf = cumulative frequency before the median class
f = frequency of the median class
h = class width
Substitute the values into the formula
Compute the median value