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: [91.125, -49.353, -4.982, -25.955, 48.882, 132.75, 67.699]

37.167