Arithmetic Mean |
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The arithmetic mean is a single value meant to "sum up" a data set. |
Let’s say you have this data set:
1, 1, 2, 2, 2, 3, 3, 4, 5, 5
What single value best represents this data?
To calculate the mean, first add up all values, then divide by the total number of values you have.
Figure 1. |
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There are two types of arithmetic mean: population mean, and sample mean. They're both calculated the same way, but they're written differently:
Figure 2. |
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Remember that N represents the size of a population, and n represents the size of a sample.