mean median most

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mean the sum of a group of data items divided by the number of data items  
compatible numbers numbers that are easy to divide  
mode the data items that occur most often in a group  
outlier a data item that is much greater or much less than the rest of the data items in a group  
median when an odd number of data items are written in order, the middle item is this  
formula an equation that shows a relationship between quantities that are represented by variables  
measures of central tendency numbers that describe groups of data  
perimeter the distance around a figure  

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