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: [193.817, 78.977, 76.476, 149.415, -83.27, -36.422, 47.619, 146.155, -45.545, 198.086]

72.531