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: [17.937, 84.657, 31.917, -38.543, -13.699, 203.232, 92.297, -51.317]

40.81