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.

Example Input: [226.287, 114.252, -53.47, 8.606, 234.708, -31.872, 163.615]
Example Output: 94.589

Example Input: [41.212, 221.072, 226.666, 3.688, 180.239, 142.767, 184.012, 63.249]
Example Output: 132.863

Example Input: [194.285, 56.469, 64.53, 100.467]
Example Output:
103.938