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P. 8
= 30 + .625
= 30.625
Example-4:Find the median of the following grouped frequency distribution:
Class Interval Frequency
0 - 4 2
4 - 8 1
8 - 12 5
12 - 16 6
16 - 20 7
Solution:
Class Interval Frequency Cumulative
frequency
0 - 4 2 2
4 - 8 1 3
8 - 12 5 8
12 - 16 6 14
16 - 20 7 21
Total 21
Here, N = 21
where N = total frequency
Thus, the median class will be (12 - 16).
Here, = 12, f = 6, c,f = 8, h = 4
= 12 + 1.67
= 13.67
Example-5: Find the values of p and q from the following data, given
median = 33
Marks Number of Students
8
