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  3. In 1974 the dollar value of imports was approximately what percent of the dollar

In 1974 the dollar value of imports was approximately what percent of the dollar

游客2024-01-12  27
问题 In 1974 the dollar value of imports was approximately what percent of the dollar value of exports? [br] 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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