Question: I know how to calculate standard deviation but what does it find? For example, the population standard deviation of 4, 7 and 8 is 1.7

I know how to calculate standard deviation but what does it find? For example, the population standard deviation of 4, 7 and 8 is 1.7 but what does this number mean? Also please explain what is variance and what is the difference between variance and standard deviation.

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The quality of the argumentation

The status rule: We tend to have more confidence in information presented by someone who has a relatively high status and rank in society than by someone who hasnt.

The spatial rule: The closer spatial proximity we have to an event, the more importance we will attach to it.