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: [216.842, -29.958, 217.533, -22.207, 51.321, 167.892, 94.714, -94.535]

75.2