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: [5.707, -74.519, 199.797, 98.597, 12.049, 147.468, -3.52, 118.303]

62.985