单项选择题

In a normal distribution, 68% of the scores lie within one standard deviation of the mean. If the SAT scores of all the high school juniors in Center City followed a normal distribution with a mean of 500 and a standard deviation of 100, and if 10,200 students scored between 400 and 500, approximately how many students scored above 600（）

A. 2,400
B. 4,800
C. 5.100
D. 7,200
E. 9,600

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单项选择题

Two buses are 515 miles apart. At 9:30 a. m., they start traveling toward each other at rates of 48 and 55 miles per hour. At what time will they pass each other（）

A、 1:30 p.m
B、 2:00 p.m
C、 2:30 p.m
D、 3:00 p.m
E、 3:30 p. m

单项选择题

Which is worth the most（）

A. 25% of the 2001 crop sold for juice
B. 10% of the 2002 crop sold for canning
C. 5% of the 2003 crop sold for freezing
D. 15% of the 2004 crop sold dried
E. 1% of the 2001 crop sold fresh