Discussion
Semi-inter quartile range is also known as
Answer: D
The semi-inter-quartile range is also known as the quartile deviation. It is half the difference between the third and the first quartile, so it is Q.D. = (Q3 - Q1)/2.
The range is the difference between the highest and lowest values, the mean is the average, and the mode is the most frequent value, so none of these is the semi-inter-quartile range. Because it uses only the middle half of the data, the quartile deviation is not disturbed by extreme values, and in a normal curve it equals 0.6745 times the standard deviation.
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