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.

[231.74, 142.135, 60.231, -34.154, 111.503, -84.615, 186.711, 52.235, 43.888, -20.096]
68.958

[-81.517, 126.001, 203.19, 236.819, 36.037, 152.691, -1.444, -37.296]
79.31

[-75.177, 102.096, 105.293, 210.327, 226.299, 66.171, 151.228, -88.673]

87.196