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: [-79.597, 26.839, 178.556, -5.626, -37.294, 232.757, 136.684]

64.617