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: [36.904, 41.881, 0.625, 113.491, -64.366, 231.261, -58.048]

43.107