What is the correct definition of frequency density?

According to a textbook I am teaching from, frequency density is merely proportional to $\dfrac{\text{frequency}}{\text{class width}}$, and could be a multiple of $\dfrac{\text{frequency}}{\text{class width}}$.

This seems wrong to me. For example, one would not say that population density could be $2\times\dfrac{\text{population}}{\text{area}}$. So why is it OK to do this with frequency density? Is the textbook misusing the term 'frequency density'?

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Frequency density is defined as the ratio of the frequency of a class to its width. There is no proportionality constant or anything of that sort.

I feel this page will help you. I am afraid the book is wrong.

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  • $\begingroup$ You can accept the answer if it helped you. $\endgroup$ – Rohan Jan 4 '18 at 12:33

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