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: [-35.54, 67.735, 184.858, 9.062, 120.196, 39.639, -52.051]

47.7