What is the difference between the mean and the median of the data set?{22, 8, 10 ,18 ,12, 20}

Add the six values: 22 + 8 + 10 + 18 + 12 + 20 = 90, so the mean is 90 ÷ 6 = 15. In order, the values are 8, 10, 12, 18, 20, 22; the median is the average of the two middle values, (12 + 18) ÷ 2 = 15. Their difference is 15 − 15 = 0, so the correct choice is A, 0.

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