Frequency distributions provide a structured way to present both discrete and continuous data in tabular form.
For discrete data, a frequency distribution table typically includes:
For continuous data, we typically use class intervals:
In the IB Math AA SL course, class intervals are given as inequalities without gaps. For example, the first interval in the height example would be written as $100 \leq h < 110$.
Histograms are graphical representations of frequency distributions for continuous data. They consist of adjacent rectangles where the area of each rectangle is proportional to the frequency in its class interval, so the height represents frequency density when class widths are unequal.
In a frequency histogram:
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