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: [218.33, 160.735, 82.339, -7.711, 178.433, -4.988, 148.44, 179.731]

119.414