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: [194.77, 17.094, 197.772, 116.223, 179.51, 62.189, 73.181, 189.435, 233.422, -30.843]

123.275