Histogram

1. HISTOGRAM
1. Histogram is a graph containing frequencies in the form of vertical rectangles.
2. It is an area diagram.
3. It is a graphical presentation of frequency distribution.
4. The X – axis is marked with class intervals.
5. The Y – axis is marked with frequencies.
6. Vertical rectangles are drawn as per the height of the frequency of each class. The
rectangles are drawn without any gap in between.
7. The width of the rectangle is equal to the range of the class.
8. The height of each rectangle is equal to the frequency of each class.
9. The histogram is a two dimensional diagram because the height and width of each
rectangle are as per data.
10. The histogram is different from a bar diagram. The bar diagram is one dimensional
because in a bar diagram the height alone is as per data and the width is not as per data.
Uses of Histogram:
1. It gives a clear picture of the entire data.
2. It simplifies a complex data.
3. It is attractive and impressive.
4. It is easily memorized.

2. 5. Median and mode can be located.
6. It facilitates comparison of two or more frequency distributions on the same graph.
7. It gives an idea of the pattern of distribution of variables in the population.