Final answer:
The mode of the bowling ball weights is the most frequently occurring weight, which, in this case, is 10 pounds, appearing 4 times.
Step-by-step explanation:
The mode of the weights of the bowling balls is the weight that occurs most frequently in the given list. We have the following weights listed for Sally and her friends' bowling balls: 10, 16, 16, 10, 12, 10, 12, 16, 10, 13.
Counting the number of times each weight occurs, we have:
- 10 pounds - 4 times
- 12 pounds - 2 times
- 13 pounds - 1 time
- 16 pounds - 3 times
The weight that occurs most frequently is 10 pounds, as it appears 4 times. Therefore, the mode is 10 pounds.