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Tech 136,973 A Histogram is NOT a Bar Chart Continued from page 1 The bars of bar charts typically have the same width. The widths of the bars in a histogram need not be the same as long as the total area is one hundred percent if percents are used or the total count if counts are used. Therefore, values in bar charts are given by the length of the bar while values in histograms are given by areas. Wikipedia includes examples of histograms with bars of unequal width such as in Figure 3.
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HEALTHCARE How social factors shape population health. Integrating the non-medical sources of health issues. Photos: The Richest Person In Every State Six Months, No Interviews -- Until I Started Breaking The Rules Figure 3. Histogram with unequal width bars. Source: Wikipedia Bar charts and histograms are introduced before high school. Here is a sample of a lesson for children covering some of the points made in this post.
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