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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