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: [35.705, 16.602, -17.205, 141.481, 186.78, 153.488, 39.999, 44.371, 113.996, 208.914]

92.413