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: [211.892, 69.725, 110.579, 178.646, 32.595, 163.527, 229.039, -42.103, 51.631, 165.973]

117.15