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The numbers represented by the x's are: 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 9.
Adding them together: 0 + 1 + 1 + 1 + 1 + 2 + 2 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 + 9 = 43
Dividing by the number of x's (16): 43 / 16 = 2.6875
The mean number of pets is 2.69.