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: [174.943, -19.337, 67.246, 202.457, 191.304, 67.278, 61.986]

106.554