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: [-14.416, 238.206, 97.167, 228.849, -35.044, 79.803, 119.148, -15.3, 92.598]

87.89