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: [-22.702, 29.378, 6.314, 3.461, 220.689, 189.379, 69.151, 213.582, 60.234, 35.064]

80.455