单项选择题


If the mean score for the iuniors were known，which of the following could be calculated from the information given
Ⅰ The range of the scores for the seniors
Ⅱ The median score for the juniors
Ⅲ The mean score for the seniors（）

A. None
B. Ⅰ only
C. Ⅲ only
D. Ⅰ and Ⅱ
E. Ⅱ and Ⅲ

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单项选择题
For the two years in which earnings from electronic operations were most nearly equal，the combined earnings from nonelectronic operations were most nearly（）

A. $340 million
B. $520 million
C. $670 million
D. $780 million
E. $1，520 million
单项选择题
From 1968 to 1980，the size of the labor force increased by approximately what percent（）

A. 20%
B. 21%
C. 27%
D. 73%
E. 80%
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