What is the mean of the snowfall amounts?
1997 = 14
1998 = 10
1999 = 17
2000 = 24
2001 = 12
2002 = 19
2003 = 15
2004 = 27
2005 = 14
2006 = 17

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?