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: [191.996, -86.097, 81.958, -22.864, 102.176, 41.523, 222.055, 2.513, 184.656, -50.416]

66.75