What is the average of n, n + 1, n + 7, n + 9, and n + 13, in terms of n?

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What is the average of <em>n</em>, <em>n</em> + 1, <em>n</em> + 7, <em>n</em> + 9, and <em>n</em> + 13, in terms of <em>n</em>?