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: [193.927, 120.599, 239.041, 198.231, 1.237, -76.34, -18.239, -97.382, 18.979, -53.788]

52.626