From the survey, it was found that there are more than 3 students in Grade 38 who
and then use a pen, all 28 people who use a pen sampan black
when thinking of the 10 percent of people, and the number of users as a pen color to 73.68 percent and the number of times the user's black pen 26.31 %
Therefore, it indicates that a pen color has an effect on more than 3 grade students.
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