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题目材料：
Parking Tickets Issued to Drivers in Town X in February 2017
(Total number of tickets issued: 420)
What is the average (arithmetic mean) number of parking tickets issued to the drivers who were issued 6 or more tickets?
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A.7.0
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B.7.5
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C.8.0
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D.8.5
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E.9.0
B显示答案
