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.

[128.916, 203.766]
166.341

[-27.722, -35.758, 83.995, -7.374, 60.825, 165.182]
39.858

[-66.116, 177.788, -23.418, 245.983, 124.609, 124.261, -66.339, 71.088, 41.044, 150.689]

77.959