how do you find the interquartile range of this data
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It tells you that middle half the observations lie within the IQR.
You find the semi interquartile range by subtracting the 25th percentile (Q1) from the 75th (Q3) percentile and dividing by 2. So, the formula looks like : (Q3 - Q1)/2
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We can't answer that without knowing the set of numbers.
for the data set shown below find the interwar range IQR. 300,280,245,290,268,288,270,292,279,282