Toner cartridges for the laser printer in your office cost $90 each, including tax. you receive an $8 refund for each empty cartridge sent back for recycling. your office uses and recycles 14 cartridges per year. what is your annual toner expense after refunds?

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?