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: [66.743, 156.936, 197.214, 118.73, 13.044, -94.04, -61.492, -93.247, -84.294, 16.947]

23.654