It gives a measure of the spread of the data.
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The median in a set of data, would be the middle item of the data string... such as: 1,2,3,4,5,6,7 the Median of this set of data would be: 4
There can be two modes in a data set. For example, in the data set {0,1,2,3,3,4,5,5,9}, there are two modes: 3 and 5.
Yes, a set of data can have two modes. It is called bimodal.
the upper quartile is the median of the upper half of a set of data. ;p
The mean of the 6th and 7th values