Betty claims that her dog can do simple addition problems. She showed her dog 8 different cards with simple addition problems, and the dog was able to tap his paw to indicate whether the answer was correct or incorrect. The dog correctly identified all 8 cards. John didn't believe Betty's dog could do addition, so he set up a trial to test whether the dog 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:
3 dots on 1
6 dots on 2
9 dots on 3
12 dots on 4
9 dots on 5
8 dots on 6
5 dots on 7
1 dot on 8
Based on these results, can Betty’s dog add?