Standard Deviation
The standard deviation tells you how tightly the data is grouped about the mean.
For example, System A and System B both have an average response time of 12 ms. However, this does not mean that the response times are similar. System A might have response times of 11, 12, 13, and 12 ms. System B might have response times of 1, 20, 25, and 2. Although the mean time is the same, the standard deviation of System B is greaterâd the response time is more varied.
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