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: [118.478, -55.08, -38.645, 58.198, 232.276, 107.542, 117.488, -37.639]

62.827