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: [154.164, 169.815, 165.561, 132.883, 7.345, -87.44, 61.366, 230.63, 131.698, 80.247]

104.627