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: [109.483, 235.126, 50.317, 161.768, -12.459, 102.281, 224.248, -27.499, 88.268, 209.2]

114.073