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: [69.271, -57.742, 121.719, 103.57, 217.286, 234.702, 24.344]

101.879