The following data are the number of pages in 40 books on a shelf. Construct a box plot using a graphing
calculator, and state the interquartile range.
We may deduce from the box plot that the distribution is more or less symmetrical, and that there are no outliers in the data.
Here we have
The box plot of the given number of pages is
By calculation we get the IQR as
Use the following information to answer the next six exercises. Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell three cars; nineteen generally sell four cars; twelve generally sell five cars; nine generally sell six cars; eleven generally sell seven cars.
Second quartile = median = percentile = _______
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