Observe on the chart can be seen, the whole circle is 100%, 35% of students who choose to study 7 from 3 to 4 hours on one. That answer was the most popular choice of students in the survey. Besides, only two students selected on the four hours, corresponding to 10% on the chart, accounting for the lowest position. The difference is 25% (5 students), the difference is quite large. In addition, two positions respectively in the middle: 2-3 hours with 5 students (25% on the pie chart) and 1-2 hours 6 students (30% on the pie chart).
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