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: [-45.201, 161.25, -67.093, 105.259, 110.499, 224.516, -55.166, 11.51]

55.697