A box plot gives a pictorial 5-number summary of data, for example, the exam grades of 100
students shown, below. The plot shows the minimum, the first quartile, the median, the 
third quartile and the maximum. The IQR or interquartile range is the length of the box. 
You can highlight any entry in the table of Grades and change it to another grade in the range 0 to 
100. You can highlight entire blocks of entries and type a single number to change them all at 
once. You can highlight blocks of entire rows/columns and press the Delete key to reduce the 
size of the class. In each case, the statistical summary and the diagram will adjust to reflect the 
changes you make. Click Refresh or Reload to return to the original.