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: [-35.507, 123.597, -55.222, 27.047, 42.631, 165.593, 96.172, -9.645, 6.352, 121.066]

48.208