Task: Program Execution
Input (English): [-13, 40, -89, 73, 19, -55, 67, -64, 10, -46, -58, -3, -22, -57, -86]
Output (English): [13.5, -24.5, -8.0, 46.0, -18.0, 6.0, 1.5, -27.0, -18.0, -52.0, -30.5, -12.5, -39.5, -71.5]