Average - statistics examples

Calculate average of file:
{90, 77, 21, 47, 46, 16, 21, 66, 15} =
{74, 27, 59, 52, 31, 70, 44, 2, 52} =
{6, 46, 51, 46, 14, 37, 22, 25, 1} =
{16, 0, 11, 71, 71, 87, 100, 18, 36} =
{47, 44, 60, 42, 6, 69, 30, 57, 97, 54} =
{17, 98, 82, 69, 77, 80, 29, 80, 84, 83} =
{98, 13, 41, 15, 67, 82, 81, 37, 96} =
{74, 19, 36, 26, 62, 100, 12, 90, 62} =
{35, 3, 88, 69, 48, 16, 84, 100, 8, 85} =
{74, 86, 8, 25, 61, 24, 26, 46, 81} =