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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.
Frequency/Class width (In a histogram it is on the y-axis, and the frequency is the area of the bars) This GCSE Bitesize Revision link is really useful:- http://www.bbc.co.uk/schools/gcsebitesize/maths/data/representingdata3hirev3.shtml
No.
It is the class frequency.