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: [105.63, -65.898, 96.962, -88.226, 172.194, 104.307, 104.654, 247.144, -70.229, 5.708]

61.225