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: [160.844, -61.583, 34.288, 211.658, 128.11, 5.309, 235.818, -7.692, 219.053]

102.867