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: [55.346, 58.176, -83.298, 157.825, -73.046, 241.84, 153.303, -48.846, 149.972]

67.919