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: [-71.759, -6.882, 88.755, 124.904, 78.518, -87.128, 200.529]

46.705