The median of the following distribution is 30. Find the missing frequencies f1 and f2:

Class   frequency

0-10      10

10-20    10

20-30      f1

30-40      30

40-50      f2 

50-60       10

Total       100

class intervalfrequencycumulative frequency
0-101010
10-201020
20-30
30-4030
40-50
50-6010
total100 

therefore 

given:  median = 30

therefore modal class = 30-40

from eq(1): 

thus missing frequencies

hope this helps you.

cheers!!

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