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: [-25.38, 150.835, -50.995, 168.105, 191.063, -80.352, 5.022, -30.642, 209.014, 174.176]

71.085