Question

how to find median in unequal class interval

Answer 1

Solution:-

The presence of unequal class intervals does not pose any problem for the calculation of median. 
So, the calculation of median remains the same as in equal class intervals.
Median is calculated using the following formula -

Median = l₁ = [{(N/2) - C.F.}/f] × i

Here,
l₁ represents the lower limit of the median class.
N represents the sum total of frequency.
C.F. represents cumulative frequency of the class preceding the median class.
f represents the frequency of the median class.
i represents the size of median class interval.