In order to calculate this value we must first understand what the lower quartile, median and upper quartile are ... To find these from the graph we draw two lines across from the vertical ...
Reading from the graph, the lower quartile is 38. To find the upper quartile, find ¾ of 40, which is the 30th value. Reading from the graph, the upper quartile is 47. The interquartile range is ...
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