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: [49.923, -80.273, 65.813, 196.58, 130.786, 127.475, 27.349, 115.206, -55.19, 128.796]

70.647