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: [9.786, 4.383, 175.284, 142.256, -95.57, -81.48, 116.872, 195.826]

58.42