单项选择题

The average (arithmetic mean) number of trees per acre in a 40-acre plot is 140. If a 10-acre section of the plot contains 90 trees per acre, how many trees are there in the remaining 30 acres

A. 5,700
B. 4,700
C. 4,200
D. 3,600
E. 2,700

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问答题

There are 100 people on a line. Aviva is the 37th person and Naomi is the 67th person. If a person on line is chosen at random, what is the probability that the person is standing between Aviva and Naomi

单项选择题

In a group of 80 students, 24 are enrolled in geometry, 40 in biology, and 20 in both. If a student were randomly selected from the 80 students, what is the probability that the student selected would not be enrolled in either course

A. 0.20
B. 0.25
C. 0.45
D. 0.55
E. 0.60

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