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Discrete Variables (bar Graph) Essay Preview: Discrete Variables (bar Graph) Report this essay Discrete Variables (bar graph)[pic 1]Md – middle value (position = )[pic 2]Continuous Variables (histogram)Each class contains its lower limit but not its upper Area (f or f* ) = Width (X) . Height (density)P ( X = a) = 0 = f*1X1 +…+f*n(Xn)[pic.