Average - statistics examples

Calculate average of file:
{74, 84, 59, 43, 20, 72, 42, 48, 9} =
{57, 11, 0, 25, 91, 36, 20, 52, 19} =
{51, 95, 3, 33, 18, 26, 74, 70, 79} =
{92, 77, 69, 85, 66, 0, 83, 87, 100} =
{43, 63, 67, 41, 34, 14, 30, 50, 18, 56} =
{38, 54, 83, 12, 14, 100, 83, 41, 7, 45} =
{100, 45, 49, 2, 15, 7, 73, 67, 10} =
{50, 5, 60, 43, 0, 29, 4, 93, 0} =
{83, 8, 26, 28, 65, 57, 34, 68, 63} =
{93, 47, 97, 58, 17, 22, 71, 37, 26} =