Task: Program Execution
Input (English): [21, -33, 89, 23, -86, -73, -4, -30, 86, -91, 83, 35, 52, -87, -15]
Output (English): [-6.0, 28.0, 56.0, -31.5, -79.5, -38.5, -17.0, 28.0, -2.5, -4.0, 59.0, 43.5, -17.5, -51.0]