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: [220.164, 60.961, -58.509, -16.616, -56.046, 167.183, 82.436, 61.171, 34.153, -6.002]

48.89