Brendan selected 10 sixth-year students in his school at random and asked each person how many years the person had lived at his or her current address. He recorded the results.
3, 8, 12, 9, 12, 8, 12, 4, 6, 12
What is the estimated mean number of years that a sixth-year student had lived at his or her current address?
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Add the 10 numbers and divide the total by 10 to find the estimated mean. It is an estimate because the times have been rounded to the nearest year.