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: [40.264, -18.79, 66.705, 31.477, 19.569, 174.417, 0.31, -93.651]

27.538