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: [84.556, -81.758, 40.949, 123.938, 210.939, 184.029, 214.385]

111.005