Bradley has a combination lock for his bicycle. He has to set each of the three parts of the lock to a digit between 0 and 9 inclusive [e. g. 517]. How many different ways can Bradley do this?

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?