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: [68.657, 143.891, 189.24, -25.665, 102.958, 222.105, 87.922, 194.815, 5.816, 236.676]

122.642