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: [-95.413, 56.579, -14.016, 236.999, -2.36, 173.346, 139.982]

70.731