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The mode of data set 2, 3, 3, 4, 5, 5, 5, 6 is
5
3
4
6
The variance of data set 2, 4, 6 is
The median of data set 3, 1, 5, 2, 4 is
The arithmetic mean of data set 2, 4, 6, 8, 10 is
Standard deviation is the