Task: Program Execution
Input (English): [-10, -87, -71, -13, -19, 8, -46, 21, 41, 70, -20, -15, 49, 31, 11]
Output (English): [-48.5, -79.0, -42.0, -16.0, -5.5, -19.0, -12.5, 31.0, 55.5, 25.0, -17.5, 17.0, 40.0, 21.0]