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: [46.64, 116.356, 31.237, -44.559, 114.819, 151.648, 67.54, -42.202, 80.551, -84.562]

43.747