We are given the following marks secured...

We are given the following marks secured by 25 students in an examination .
23,28,30,32,35,36,36,40,41,43,44,44,45,48,49,52,53,54,56,56,58,61,62,65,68.
(i)Arrange this data in the form of a frequency distribution taking the following class intervals.
20-29,30-39,40-49,50-59, and 60-69
(ii) Draw the frequency polygon and ogive for the above data.

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