Task: Program Execution
Input (English): [-31, 47, -12, 69, 3, 15, 55, 87, 81, 75, -77, -59, -28]
Output (English): [8.0, 17.5, 28.5, 36.0, 9.0, 35.0, 71.0, 84.0, 78.0, -1.0, -68.0, -43.5]