ABSTRACT
At the end of this chapter, you should be able to:
• distinguish between discrete and continuous data • present data diagrammatically – pictograms, horizontal and vertical bar charts, percentage component bar
charts, pie diagrams • produce a tally diagram for a set of data • form a frequency distribution from a tally diagram • construct a histogram from a frequency distribution • construct a frequency polygon from a frequency distribution • produce a cumulative frequency distribution from a set of grouped data • construct an ogive from a cumulative frequency distribution
Data are obtained largely by two methods:
(a) By counting – for example, the number of stamps sold by a post office in equal periods of time.
