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: [-60.466, 109.906, 198.964, 97.457, -70.924, -46.929, 55.528, 147.605]

53.893