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In 1974 the dollar value of imports was approximately what percent of the dollar value of exports? If it were discovered that t
In 1974 the dollar value of imports was approximately what percent of the dollar value of exports? If it were discovered that t
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2012-10-19
64
问题
In 1974 the dollar value of imports was approximately what percent of the dollar value of exports?
If it were discovered that the import dollar amount shown for 1978 was incorrect and should have been $ 5. 3 billion instead, then the average ( arithmetic mean) import dollar amount per year for the 17 years would be how much less?
选项
A、$100 million
B、$53 million
C、$47 million
D、$17 million
E、$7 million
答案
A
解析
若发现图中所示的1978年的进口额有误,正确值应为53亿美元,那么这17年进口额的(算术)平均值将会减少多少?
解:本题的正确答案为(A)。1978年的进口额的正确值为$5.3 billion,与图中所示的$7 billion相比,少了1.7 billion,因此这将使17年的进口额的算术平均值减少量为:1.7/17=$0.1 billion=$100 million
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