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: [134.272, -35.351, -5.769, -27.357, -93.524, -78.423, 162.237, -77.72, 29.089, 127.209]

13.466