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  3. The 10 households on a certain street have household incomes that range from $34,000 to $150, 000 and an average (arithmetic mea

The 10 households on a certain street have household incomes that range from $34,000 to $150, 000 and an average (arithmetic mea

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问题 The 10 households on a certain street have household incomes that range from $34,000 to $150, 000 and an average (arithmetic mean) household income of $ 60,000. If the household with the highest income and the one with the lowest income are excluded. What is the average household income for the remaining 8 households?
选项 A、$41,600
B、$47,000
C、$52,000
D、$61,000
E、$75,000
答案C
解析 某一街道上10个家庭的家庭收入在34,000美元至150,000美元之间，平均(算术平均)家庭收入为60,000美元。若把收入最高的家庭和收入最低的家庭排除在外，那么剩余8个家庭的平均收入是多少?
解：本题的正确答案是(C)。由题意可得：(60000×10 - 34000 - 150000)÷8=52,000美元
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