Final answer:
The mean weight of the cats is 12 pounds.
Step-by-step explanation:
To find the mean weight of the cats, we need to calculate the average of the given weights. The given weights are 11, 9, 10, 15, and 15 pounds.
Step 1: Add up all the weights: 11 + 9 + 10 + 15 + 15 = 60
Step 2: Divide the sum by the total number of weights: 60 ÷ 5 = 12
The mean weight of the cats is 12 pounds.