Barbara claims that her horse can do simple addition problems. she showed her horse 8 different cards with simple addition problems, and the horse was able to tap his foot to indicate whether the answer was correct or incorrect. the horse correctly identified all 8 cards. eric didn't believe barbara's horse could do addition, so he set up a trial to test whether the horse was just guessing. he flipped 8 coins to see how many would land tails up. he did this 53 times, and the results are shown in the dot plot below: