单项选择题

Because her test turned out to be more difficult than she intended it to be, a teacher decided to adjust the grades by deducting only half the number of points a student missed. For example, if a student missed 10 points, she received a 95 instead of a 90. Before the grades were adjusted the class average was A. What was the average after the adjustment（）
<
(E) A+25

A.A
B.B
C.C
D.D
E.E

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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
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
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