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: [149.954, 109.755, 83.553, -90.026, -6.386, -46.118, 207.425, 29.481]

54.705