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To calculate the frequency density we will simply divide the frequency by the class width.
The relative frequency of a class is the frequency of the class divided by the total number of frequencies of the class and is generally expresses as a percentage.
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Class mark = (10.5 + 17.5)/2 = 14Class mark = (10.5 + 17.5)/2 = 14Class mark = (10.5 + 17.5)/2 = 14Class mark = (10.5 + 17.5)/2 = 14