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: [21.676, 24.735, 150.751, -97.819, 85.382, 131.583, 162.831, 227.834]

88.372