Frequency Distribution: A tabular summary of data showing the number (frequency) of data values in each of several nonoverlapping classes.
Frequency is the number of occurrences of a repeating event per unit of time. It is sometimes called temporal frequency when emphasizing the contrast with spatial frequency, and normal frequency when emphasizing the contrast with angular frequency.
Frequency is measured in Hertz (Hz), which corresponds to one (event) per second. The corresponding period is the length of time for one cycle of the repeating event, so the period is the reciprocal of the frequency. For example, if the heart beats at a rate of 120 times (2 hertz) in her minute, it is a cycle.
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