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: [242.036, 124.851, 145.536, 239.366, 123.19, -60.718, 219.195, 64.154]

137.201