Definition: 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.
Input: [172.614, 46.128, 219.08, -19.082, 92.393, -22.178, -67.633, 40.09]

57.677