4
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The interval is, presumably, the range = 12.
10 8 4 5 8 6 12 1 Write these data in an increasing order: 1 4 5 6 8 8 10 12 The range of these data is the difference of the larger value and the smaller value: 12 - 1 = 11 Thus, the range is 11.
Mean: 3 I think the range is 7 or 8
8 and 12
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