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: [-87.973, 63.926, -52.186, -62.799, 112.047, 87.475, -45.29, 164.877, 197.484]

41.951