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: [195.742, 80.759, 238.547, 1.412, 208.973, -89.236, -62.533, -90.54, -34.505]

49.847