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: [15.293, 221.056, 241.387, 81.3, 102.644, 146.885, -33.65, -36.56, -69.176]
Example Output: 74.353

Example Input: [241.486, -13.877, 1.808, 200.765, 223.234, -42.449, 127.587, 78.763, -80.96, -58.717]
Example Output:
67.764

