The data below provides the diameter, height, and volume of 31 black 
cherry trees in Allegheny National Forest.  The "diam" is the diameter 
of the tree in feet (measured at 4.5 feet above ground). The "hght" is 
the height of the tree in feet. The "volm" is the volume of the tree 
in cubic feet.

 volm   diam         hght
 10.3   0.69167      70
 10.3   0.71667      65
 10.2   0.73333      63
 16.4   0.87500      72
 18.8   0.89167      81
 19.7   0.90000      83
 15.6   0.91667      66
 18.2   0.91667      75
 22.6   0.92500      80
 19.9   0.93333      75
 24.2   0.94167      79
 21.0   0.95000      76
 21.4   0.95000      76
 21.3   0.97500      69
 19.1   1.00000      75
 22.2   1.07500      74
 33.8   1.07500      85
 27.4   1.10833      86
 25.7   1.14167      71
 24.9   1.15000      64
 34.5   1.16667      78
 31.7   1.18333      80
 36.3   1.20833      74
 38.3   1.33333      72
 42.6   1.35833      77
 55.4   1.44167      81
 55.7   1.45833      82
 58.3   1.49167      80
 51.5   1.50000      80
 51.0   1.50000      80
 77.0   1.71667      87