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# Histogram

A histogram is a graphical illustration of a frequency distribution of a data set that contain numerical data. Histograms have several defining characteristics.
• The data is grouped into specific ranges of values known as intervals.
• All intervals in a histogram must be the same size.
• Interval data is marked in groups along the horizontal axis.
• The histogram is the collection of rectangles drawn above the intervals.
• The height of each rectangles is proportional to the frequency of the data in the corresponding interval.
Say a certain fruit store wants to examine the weights of the apples they sell. To see the distribution, it is not necessary to show each apple's weight individually; instead, the apples can be grouped by their weights in intervals: and so on.
A histogram looks similar to a bar graph, but in a histogram there are numbers on the horizontal axis and the bars cannot have a space between each other, since the data is continuous.