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To find the mean of the data, we add up all the values and divide by the total number of values.
1 + 2 + 2 + 2 + 3 + 4 + 4 + 5 + 6 + 6 = 35
Now, we divide by the total number of values (10) to find the mean:
Mean = 35 / 10 = 3.5
Therefore, the mean number of pieces of pizza people ate at the pizza party is 3.5. This means, on average, people ate about 3.5 pieces of pizza each.