单项选择题

George earned 80, 85 and 90 on the first three tests in his geography class. Because he didn’t have time to study, he decides to guess randomly on the final test. That test has ten true-false questions, each worth 10 points. What is the probability his final average is more than 85（）

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

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多项选择题
Every year between 70% and 85% of the students at Central High School attend the homecoming rally. If one year 1435 students attended the rally, which of the following could have been the number of students at Central High School that year Indicate all possible numbers of students.（）

A. 1675
B. 1775
C. 1875
D. 1975
E. 2075
单项选择题
An investor wants to sell some of the stock that he owns in Micro Tron and Dynaco Corporations. He can sell Micro Tron stock for $ 36 per share, and he can sell Dynaco stock for $ 52 per share. If he sells 300 shares altogether at an average price per share of $40, how many shares of Dynaco stock has he sold（）

A. 52
B. 75
C. 92
D. 136
E. 184
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