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: [60.438, 0.055, 120.026, -57.759, 8.486, 180.778, 203.836, 247.396, 104.095, -85.403]

78.195