A diagram that shows the following statistics:
                12, 12, 13, 14, 15, 15, 16, 17

              1. The Minimum Value
                minimum is 12
            2. Lower quartile (the median of the 1st one-forth of an ordered list of numbers)
                 lower quartile: median of (12, 12, 13, 14) = (12+13)/2 = 12.5
            3. The Median
                 median is average of 14 and 15 = 14.5
            4. Upper quartile (the median of the last oneforth  of an ordered list of numbers)
                 upper quartile: median of (15, 15, 16, 17) = (15+16)/2 = 15.5
            5. Maximum Value
                maximum is 17

Box and Whisker Plot