Because the IQR excludes values which are lower than the lower quartile as well as the values in the upper quartile.
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No, since range is max-min and IQR is Q3-Q1. Q1 must be greater than the max and Q3 must be less than the min.
Interquartile Range, or IQR
It tells you that middle half the observations lie within the IQR.
Ohms
for the data set shown below find the interwar range IQR. 300,280,245,290,268,288,270,292,279,282