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: [2.302, 221.287, 110.424, -30.176, 118.489, 126.194, -89.842, 104.176, 127.858, 197.862]

88.857