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A histogram is a graphical representation of a frequency distribution in the form of adjacent rectangles with class intervals as base and heights proportional to the frequency of those class intervals.

A histogram is a two dimensional figure. In this unit, we shall discuss the construction of a Histogram for the following frequency distribution:

(i) A continuous grouped frequency distribution with unequal class-intervals.

(ii) A continuous grouped frequency distribution with equal class-intervals.

(iii) A grouped frequency distribution with class-intervals in inclusive form.

(iv) A grouped frequency distribution in which class marks are given.

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