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: [140.577, 17.004, -23.097, 237.61, -34.132, 101.321, -78.007, 136.557]

62.229