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: [177.435, 227.721, 3.771, 62.398, -50.349, 215.672, 97.194]

104.835