Count the number of events occurring during a time period. Then frequency = number of events/length of time period.
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c=frequency x wavelength
speed=frequency x wavelenth xD
period
To calculate cumulative frequency, you first need to have a frequency distribution table. Start by adding up the frequencies of the first category. Then, for each subsequent category, add the frequency to the cumulative frequency of the previous category. The final cumulative frequency will be the total number of observations in the data set.
To calculate the frequency density we will simply divide the frequency by the class width.