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: [202.606, 144.407, 56.232, 202.752, -33.035, 131.415, 238.074, -84.02, 12.128, 187.152]

105.771