Find the range of the data 9, 5, 9, 3, 4, 7, 8, 4, 8, 9, 5, 9.
Arrange it in increasing order = 3, 4, 4, 5, 5, 7, 8, 8, 9, 9, 9, 9
Range means difference between highest and lowest number = 9 - 3 = 6.
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