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: [83.226, 180.415, 90.764, 188.245, 45.542, -53.748, 154.893, 222.861]

114.025