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The first volume of the fourth grade math column records the time of going to bed and getting up.
The first volume of the fourth grade mathematical histogram records the time of sleeping and getting up.

1 The normal sleep time of students in grades 4 and 4 is about 10 hour.

2. According to this data, the combined statistical time is Saturday, the vertical axis of the statistical chart is 7 grids, and it is more appropriate to determine the unit quantity as 2, which is divided into 6 grids.

3. The horizontal axis represents Saturday and the vertical axis represents sleep time.

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