Arithmetic mean

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The arithmetic mean or average of a finite sequence of real numbers having $n$ terms is the sum of all the terms divided by $n$. For example, the arithmetic mean of the first ten positive integers is 5.5 (since 1 + 2 + 3 + ... + 10 = 55).

The concept of balanced primes (A006562) depends on the arithmetic mean: given a prime $p_{i}$, if $p_{i}={\frac {p_{i-1}p_{i+1}}{2}}$, then it is a balanced prime (such as 5, which is the arithmetic mean of 3 and 7).

Compare geometric mean and harmonic mean.