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: [34.413, 151.38, -95.133, 145.705, -32.112, -33.076, 74.322, -67.125, 171.927, -51.021]

29.928