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: [105.239, 215.988, 207.513, 161.111, 214.529, 232.214, 129.468, 240.417]

188.31