单项选择题

Which of the following sets of numbers has the greatest standard deviation

A. 2, 3, 4
B. 2.5, 3, 3.5
C. 1, 1.25, 1.5
D. -2, 0, 2
E. -20, 21, 21.5
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单项选择题
In a group of 100 students, more students are on the fencing team than are members of the French club. If 70 are in the club and 20 are neither on the team nor in the club, what, is the minimum number of students who could, be both on the team and in the club
A. 10
B. 49
C. 50
D. 60
E. 61
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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