One the selling points of golf balls is their durability. An independent testing laboratory is commission to compare the durability of three different brands of golf balls. Balls of each type will be put inte machine that hits the balls with the same force that a golfer uses on the course. The number of hits requir until the outer covering cracks is recorded for each ball, with the results given the table below. Ten ba from each manufacturer are randomly selected for testing Brand A 310 261 233 235 219 289 279 263 301 306 247 264

A seesaw is a flat board that is balanced on a fulcrum (point of balance). When the weight at either end is equal, the seesaw is balanced and both ends are at the same height. When weight is added to either side, the balance will tilt in that direction. To prevent the balance from tipping, the location of the fulcrum must be moved to accommodate the difference in weights placed on each end. A playground equipment company wants to produce a seesaw that will be perfectly balanced when an adult and a child are on either end. The company estimates that an adult, on average, weighs four times as much as a child. The length of the seesaw is 10 feet. C A { 01 2 3 4 5 6 7 8 9 10