Histogram and cumulative frequency calculator

Type each class interval and its frequency. Get the histogram (using frequency density for unequal classes), the cumulative frequency curve and the estimates.

Learn histograms properly

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Questions students ask

How do you draw a histogram with unequal class widths?

Plot frequency density (frequency ÷ class width) on the vertical axis, so the area of each bar shows its frequency.

How do you find the median from a cumulative frequency curve?

Go across from half the total frequency to the curve, then down to the value axis.

Free notes on histograms

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