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: [114.041, 53.494, 14.751, -0.392, -70.081, 116.8, 1.044, -50.731]
Example Output: 22.366

Example Input: [24.119, 239.006, 239.873, 236.27, 134.34]
Example Output: 174.722

Example Input: [116.841, -31.109, -50.642, 93.911, 153.195, 169.393]
Example Output:
75.265