The following table gives the distribution of students of two sections according to the marks obtained by them:


Section A



Section B



Marks



Frequency



Marks



Frequency



0 - 10


10 - 20


20 - 30


30 - 40


40 - 50



3


9


17
12


9



0 – 10


10 20


20 - 30


30 - 40


40 - 50



5


19


15


10


1



Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections.

The class marks can be found by

=


Now,


For section A,


MARKS



CLSS MARKS



FREQUENCY



0-10



5



3



10-20



15



9



20-30



25



17



30-40



35



12



40-50



45



9



For section B,


MARKS



CLSS MARKS



FREQUENCY



0-10



5



5



10-20



15



19



20-30



25



15



30-40



35



10



40-50



45



1



Now, the frequency polygon for the given data:



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