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 often written as inequalities using half open intervals so that adjacent classes do not overlap. 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 with areas proportional to the frequencies of the class intervals they represent.
In a frequency histogram:
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