An oceanographer was studying dolphins and their jumping patterns. One dolphin was observed jumping out of the
water 12 feet and then back into the water -10 feet. The same dolphin then jumped out of the water again reaching
11 feet and then back into the water -9 feet. What was the dolphin's average distance above or below the water?
To find an average depth, you add up all of the listed depths and divide by the number of items listed.