Julia surveyed twenty households on her street to determine the average number of children living in each household. The tables below represent the collected data and a randomly selected sample from the population. Compare the mean of the population with the mean of the sample. Population Data03313222543330120233Sample Data53024What is the difference between the mean of the sample and the mean of the population?
The population values sum to 45, so the population mean is 45 ÷ 20 = 2.25 children per household. The sample values sum to 14, so the sample mean is 14 ÷ 5 = 2.80. Their difference is 2.80 − 2.25 = 0.55, so the answer is 0.55.
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