In this task you will be given a list of numbers and you need to find the mean (average) of that list. The mean of a list can be found by summing every number in the list then dividing the result by the size of that list. The output should be rounded to 3 decimal places.

[102.553, 221.594, -69.406, 192.534, 139.703, -38.208, 228.963, 32.921]
101.332

[-32.499, 21.999, 235.435, 58.638, -57.806, 224.947, 74.782]
75.071

[214.085, 240.112, 120.008, 153.245, 246.47]

194.784