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List K consists of 100 numbers between 20 and 40, and list M consists of 200 numbers between 30 and 50.
Quantity A：The arithmetic mean of the members in list K
Quantity B：The arithmetic mean of the members in list M
Quantity A：The arithmetic mean of the members in list K
Quantity B：The arithmetic mean of the members in list M
D显示答案
以上解析由 考满分老师提供。
