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

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

单项选择题

If a is increased by 25% and b is decreased by 25%, the resulting numbers will be equal. What is the ratio of a to b（）

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