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: [143.279, -51.718, 94.004, -14.931, 77.142, 87.537, -51.96, 0.993]

35.543