Median = size of  item = size of 50th item which lies in (20 -30) class-interval.
Alternative formula :
Median
Note that, while calculating the median of a series, it must be put in the 'exclusive class-interval' form. If the original series is in inclusive type, first convert it into the exclusive type and then find its median.
Example The following distribution represents
the number of minutes spent by a group of teenagers in watching
movies. What is the median ?
Minutes/Weeks:0-99 100-199 200-299 300-399 400 - 499 500 - 599 600 & more
No. of teenagers : 27 32 65 78 58 32 8
Solution:
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