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: [-29.693, 218.483, 91.889, 219.68, 109.158, -68.877, 221.54, 245.156, -20.18, 80.054]

106.721