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: [-27.751, 64.278, -45.987, 153.077, -69.446, 234.524, 73.888, 6.085, 186.898, 231.144]

80.671