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: [35.898, 5.888, -70.803, 39.487, -64.013, -5.472, 173.391, 229.669, 71.343, 153.543]

56.893