Write a set of data that contains 12 values for which the box plot has no whiskers. State the median, first and third quartiles, and lower and upper extremes.
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Consider the ordered dataset: 3.5, 3.5, 3.5, 3.5, 5, 7, 9, 11, 12.5, 12.5, 12.5, 12.5.

The lower limit is 3.5 and the upper limit 12.5.

Q1=3.5, Q2=Median=8, Q3=12.5 for the quartiles. The box plot is shown below:

When the data range is the same as the interquartile range there are no whiskers.

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