ABSTRACT
At the end of this chapter, you should be able to:
• determine the mean, median and mode for a set of ungrouped data • determine the mean, median and mode for a set of grouped data • draw a histogram from a set of grouped data • determine the mean, median and mode from a histogram • calculate the standard deviation from a set of ungrouped data • calculate the standard deviation from a set of grouped data • determine the quartile values from an ogive • determine quartile, decile and percentile values from a set of data
A single value,which is representative of a set of values, may be used to give an indication of the general size of the members in a set, the word ‘average’ often being
used to indicate the single value. The statistical term used for ‘average’ is the ‘arithmetic mean’ or just the ‘mean’. Other measures of central tendency may be used and these include the median and the modal values.
