Class 9 Maths Statistics Histogram



This is a form of representation like the bar graph, but it is used for continuous class intervals.

Given grouped frequency distribution data for lifetime in hours for bulbs.

The histogram is plotted using data on left.

Here variable is Life time & value is number of lamps. Variable Lifetime is shown in X axis & value (number of lamps) is denoted in Y axis. The height of the bar denotes the value of variable (Number of lamps). There is no gap between the graphs, since it represents continuous class interval data.





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