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: [68.802, 203.777, 102.066, -14.825, -20.498, 173.24, 201.599]

102.023