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: [-75.264, -61.515, 132.024, 121.639, 116.464, 69.691, -19.225, 193.734, 127.735, 230.003]

83.529