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Mean is the arithmetic average (add all of the numbers and divide by how many).

There are 8 numbers : Mean = (8.2 + 8.7 + 8.1 + 8.5 + 8.1 + 8.6 + 8.2 + 8.1) / 8 = 66.5/8 = 8.3125

Median is the middle of the set. The set needs to be ordered {8.1 8.1 8.1 8.2 8.2 8.5 8.6 8.7} Note that there are an even number of data points (8), so the median is the average of the middle two numbers. In this case the middle two numbers are {8.2 8.2} so the Median = 8.2

Mode is the number that occurs most often. Looking at the ordered set above, 8.1 occurs three times, 8.2 occurs two times, and 8.5, 8.6, and 8.7 each occur one time, so Mode = 8.1

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Q: What is the mean median and mode of 8.2 8.7 8.1 8.5 8.1 8.6 8.2 8.1?
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