Answer :

Theory.


The number of times a particular observation occurs in data is called frequency.


Showing data in tabular form with showing frequency of each distribution. This representation is called Frequency distribution table.



(i) Third interval is 30-40


The frequency of the Third interval is 10


(ii) Class size = upper limit – lower limit


In class interval 30-40


Upper limit of interval is 40


Lower limit of interval is 30


Class size = 40 – 30 = 10


Midpoint =


= = = 35


(iii) Range = highest – lowest


Highest Score is 64


Lowest Score is 12


Range = 64 – 12 = 52


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