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: [-56.898, -9.484, 7.689, 205.423, 224.562, -38.588, 120.312, 92.879]

68.237