Frequency density and histograms with unequal class width

Calculate and use frequency density to draw histograms (unequal class width), and interpret and compare data sets displayed in histograms (unequal class width).

Students are required to know the formula for frequency density (see Appendix 2).
Correct labelling of frequency density axis or use of an appropriate key) will be expected. (But see note in 2a.03)
Use of a standard class width with appropriate units will be acceptable.