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? A.$100 million B.$53 million C.$47 million D.$17 million E.$7 million
A.$100 B.$53 C.$47 D.$17 E.$7
【参考答案】
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......