Statistics?

Algebra Level 3

The elements of set SS of real numbers with cardinality nn form an arithmetic progression with common difference dd. Express the population standard deviation of set SS in terms of nn and dd.

An example of set SS is 2, 5, 8, 11, 14, 17\text{{2, 5, 8, 11, 14, 17}}. It has cardinality 6, and its elements form an AP with common difference 3.

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