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Rather than count each square individually, count the squares (8) along the top of a chess board, and count the squares (8) down the side. 8 x 8 = 64 squares in total. (You could, if you wish, also include the whole board as a square = 65.)
8 seconds
Sum = 36 Count = 6 Average = Sum/Count = 36/6 = 6
Sum = 678 Count = 8 So Average = Sum/Count = 678/8 = 84.75
8x7 count by 7 8 times