Students in a class were asked how many pets they had at home. Their answers are given below. 0, 0, 0, 0, 2, 2, 2, 2, 3, 3, 4, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8 Refer to the data above. What was the population mean of the number of pets living in the students’ homes according to the pet survey?