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: [194.148, -91.187, -22.091, 68.751, 193.642, -0.082, 171.224, 12.594, -78.608]

49.821