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A quiz has 20 items. The following are the scores of 30 students in grade ten.

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18, 15, 10, 12, 20, 20, 15, 12, 10,8
5, 12, 15, 16, 18, 20, 8, 7, 9, 6
20, 19, 19, 13, 11, 10, 17, 14, 12, 11
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1. P20

2. P30

3. P50

4. P60

5. P90
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