To find the average weight of Breed A, we add all the weights (10 + 8 + 7 + 10 + 9 + 9 + 10 + 9 = 72) and divide by the number of rabbits (8), giving us an average weight of 9 pounds. For Breed B, we do the same (10 + 12 + 14 + 13 + 10 + 15 + 11 + 12 = 97) and divide by 8, which gives us an average weight of 12.125 pounds.
Different weights within breeds can be caused by factors like genetics, diet, age, and health. To track the growth rate of the two breeds, I would measure the weight of each rabbit at regular intervals, like every month, and record the data to see how much each rabbit grows over time.