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A poll reveals that the average (arithmetic mean) income of 10 households is $25,000. If 6 of the households have incomes of $30,000 each, what is the average income of the other 4 households?
  • A$21,500
  • B$20,500
  • C$17,500
  • D$7,500
  • E$7,000
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正确答案: C

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