# Standard Deviation

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Standard Deviation

In the last section, we saw several methods of determining the approximate "center" of a set of data. Another important characteristic of a set of data is how closely those data group around the center. Take a look at the following graphs:

**Figure 8**

Frequency Distribution of Test Scores

**Figure 9**

Frequency Distribution of Test Scores

**Figure 10**

Frequency Distribution of Test Scores