In measuring the frequency of sound, electromagnetic waves (such as radio or light), electrical signals, or other waves, the frequency in hertz is the number of cycles of the repetitive waveform per second.
Frequency has an inverse relationship to the concept of wavelength. The frequency f is equal to the speed v of the wave divided by the wavelength λ of the wave:
In statistics, the frequency of an event is simply the number of times the event occurred in the experiment or the study. These frequencies are often graphically represented in histograms.
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