Solve the problem.What is the size relationship between the interquartile range and the standard deviation of a data set?
A. The interquartile range can be smaller than, equal to, or bigger than the standard deviation.
B. The interquartile range is always equal to the standard deviation.
C. The interquartile range is always more than the standard deviation.
D. The interquartile range is always less than the standard deviation.
E. none of these
Answer: A
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?
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 