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: [84.339, 13.576, 175.748, -93.474, 82.773, -3.642, 177.391]

62.387