Task: Program Execution
Input (English): [-28, -19, 29, -21, -22, -23, 22, -21, 76, -56, -68, -29, -47, -17, 84]
Output (English): [-23.5, 5.0, 4.0, -21.5, -22.5, -0.5, 0.5, 27.5, 10.0, -62.0, -48.5, -38.0, -32.0, 33.5]