Mark is purchasing an assortment of bowling balls for his students on the high school bowling team. The weights of the first seven balls are 11, 12, 7, 11, 9, 7, and 11. How many pounds does the last ball need to weigh if he wants the average weight for all balls to be 11 pounds? Round your answer to the nearest whole number. Be sure to show your work.

shadster Sep 8, 2022