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: [-86.197, 162.215, 210.677, 164.551, 163.062, 13.106, 139.068, 114.418]

110.112