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: [113.626, 85.944, 91.318, 34.374, 166.521, 195.567, 171.298, -57.102, -40.545, 101.75]

86.275