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: [122.737, 189.477, -4.853, 150.031, 126.296, 240.809, 204.743, 29.178]

132.302