Cumulative frequency diagrams

Representing data


Draw a cumulative frequency graph. May be asked to draw a graph/diagram/curve or polygon. When dealing with uneven class widths and a large initial class width, use a hanging curve, i.e. do not plot the lower bound of the first interval. When using a final open class interval, make a sensible approximation. And Find the median, lower quartile, upper quartile, IQR and other measures from the cumulative frequency graph. Divide the data into common fractions or percentages
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