Average - statistics examples

Calculate average of file:
{64, 42, 7, 81, 33, 10, 9, 52, 61, 55} =
{85, 98, 40, 53, 93, 66, 30, 7, 48, 71} =
{9, 70, 45, 16, 13, 47, 22, 62, 1, 61} =
{81, 57, 77, 14, 33, 18, 18, 76, 62} =
{75, 16, 100, 73, 34, 61, 37, 6, 30, 54} =
{2, 8, 30, 71, 35, 21, 5, 74, 14, 11} =
{4, 69, 96, 57, 4, 81, 55, 17, 3} =
{37, 64, 41, 35, 66, 9, 41, 60, 74} =
{58, 77, 40, 82, 32, 20, 10, 23, 47} =
{12, 10, 44, 33, 18, 37, 61, 83, 80} =