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: [-35.824, 80.709, 151.663, -69.298, 20.263, 210.986, 238.061, -37.229]

69.916