As part of the National Health and Nutrition Examination Survey, subjects were asked how long they slept

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As part of the National Health and Nutrition Examination Survey, subjects were asked how long they slept the preceding night, and the following times (hours) were reported:

8, 7, 5, 7, 4, 7, 6, 7, 8, 8, 8, 6.

Find the mean.

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