What is the mean of the data set 3, 7, 7, 2, 9?

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Multiple Choice

What is the mean of the data set 3, 7, 7, 2, 9?

Explanation:
The mean is the average: you add all the numbers and then divide by how many numbers there are. For 3, 7, 7, 2, 9, the sum is 28. There are 5 numbers, so 28 ÷ 5 = 5.6. So the mean is 5.6. If you check the other options by thinking about what total they would imply (25, 30, or 23), they don’t match the actual total, so they aren’t the mean.

The mean is the average: you add all the numbers and then divide by how many numbers there are. For 3, 7, 7, 2, 9, the sum is 28. There are 5 numbers, so 28 ÷ 5 = 5.6. So the mean is 5.6. If you check the other options by thinking about what total they would imply (25, 30, or 23), they don’t match the actual total, so they aren’t the mean.

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