Histogram chart plots the frequency distribution of data against the defined class intervals or bins. These bins are created by dividing the raw data values into a series of consecutive and nonoverlapping intervals. Based on the number of values falling in a particular bin, frequencies are then plotted as rectangular columns against continuous xaxis.
The following images show a histogram and a cumulative histogram created using FlexChart.
Histogram  Cumulative Histogram 

Once you provide relevant data, FlexChart automatically calculates the intervals in which your data is grouped. However, if required, you can also specify the width of these intervals by setting the BinWidth property. To create a histogram, you need to add the Histogram series and set the ChartType property to Histogram. You can also create a cumulative histogram by setting the CumulativeMode property to true.
FlexChart generates frequency distribution for the data and plots the same in histogram, upon providing relevant data as shown in the following code snippet.
FlexChart also provides you various options to create following variations of Histogram:
A frequency polygon shows a frequency distribution representing the overall pattern in the data. It is a closed twodimensional figure of straight line segments created by joining the mid points of the top of the bars of a histogram.
Use the following steps to create a frequency polygon using histogram chart.
Moreover, you can also create a cumulative frequency polygon by setting the CumulativeMode property to true.
The following images show a frequency polygon and a cumulative frequency polygon created using FlexChart.
Frequency Polygon  Cumulative Frequency Polygon 

Use the following code snippet to create a frequency polygon.
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histogramSeries.HistogramAppearance = HistogramAppearance.FrequencyPolygon; histogramSeries.FrequencyPolygonStyle = new ChartStyle() {Stroke = new SolidBrush(Color.Red), StrokeWidth = 2}; //To create a cumulative frequency polygon histogramSeries.CumulativeMode = true; 
Gaussian curve is a bell shaped curve, also known as normal curve, which represents the probability distribution of a continuous random variable. It represents a unimodal distribution as it only has one peak. Moreover, it shows a symmetric distribution as fifty percent of the data set lies on the left side of the mean and fifty percent of the data lies on the right side of the mean.
Use the following steps to create a Gaussian curve using histogram chart.
Following image illustrates a Gaussian curve created using FlexChart, which depicts probability distribution of scores obtained by students of a university in half yearly examinations.
Use the following code snippet to create a Gaussian curve.
Example Title 
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histogramSeries.HistogramAppearance = HistogramAppearance.Histogram; histogramSeries.NormalCurve.Visible = true; histogramSeries.NormalCurve.LineStyle = new ChartStyle() {Stroke = new SolidBrush(Color.Green), StrokeWidth = 2 }; 