单项选择题

When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students

A. 6.5
B. 6.75
C. 7.0
D. 7.25
E. 7.5
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单项选择题
At the time during year X when the difference between the price of ABC common stock and the price of XYZ common stock was at its greatest, the price of XYZ common stock was approximately what percent of the price of XYZ common stock and ABC common stock combined（）

A. 16%
B. 30%
C. 36%
D. 42%
E. 103%
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