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: [-7.057, 122.729, -78.932, 52.502, 191.819, 80.994, 29.505, -10.501]

47.632