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: [112.303, 240.968, 30.647, -71.557, 193.879, -78.228, 112.661, 141.959, -66.425, 115.618]

73.182