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: [35.457, 222.093, 213.643, 88.716, -11.415, 190.333, 38.58, 56.243, 80.049]

101.522