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: [114.214, 180.975, 3.941, 110.699, 193.845, 19.516, -19.4]

86.256