单项选择题

If in 1900 the water use in Country K was the same as that in Country X，but increased at the constant rate of 3 billion gallons every year，then the two countries would again have had the same water use in approximately what year（）

A. 1910
B. 1920
C. 1930
D. 1940
E. 1950

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单项选择题

If 5 points were added to each score，which of the following would NOT be affected（）

A. The highest score
B. The mean for all scores
C. The median for the seniors’ scores
D. The mode for the iuniors’ scores
E. The standard deviation for all scores

单项选择题

Approximately what percent of the new domestic cars sold retail in the United States in 1983 were manufactured by Company Q（）

A. 10%
B. 12%
C. 15%
D. 17%
E. 23%