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: [206.289, -8.849, 56.154, -53.117, -64.061, -74.533, 131.111, 107.938, 201.014, 75.021]

57.697