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A five-number summary of the data set is:
the minimum value - 0th percentile
first quartile (Q1) - 25th percentile
median - 50th percentile
third quartile (Q3) - 75th percentile
the maximum value - 100th percentile
The interquartile range is found by subtracting the third quartile minus the first quartile:
IQR = Q3 - Q1