Task: Program Execution
Input (English): [-71, -78, -84, 6, 99, 66, -90, -36, -77, -56, 19, -59, 71]
Output (English): [-74.5, -81.0, -39.0, 52.5, 82.5, -12.0, -63.0, -56.5, -66.5, -18.5, -20.0, 6.0]