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: [187.734, 92.73, 72.075, -59.81, 198.435, 116.894, 36.867]

92.132