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: [-95.317, 234.28, 50.709, -52.738, 146.488, 94.792, 154.517, 113.549, 240.638]

98.546