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: [20.042, -34.805, 194.951, 100.986, -65.679, 83.11, 151.529, 129.186, -80.74, -5.566]

49.301