Calculating Statistics  
Summary 
an average is a number that is typical of a set of values. there are three commonly used types of average; the mean, the median and the mode. the range of a set of values gives an indication of how spread out the values are. a stem and leaf diagram is a convenient way to arrange data in order and find the median and other statistical information. 
Key Skills 

Vocabulary 
average, median, mode, mean, stem and leaf diagram. 