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: [185.771, 207.565, 244.271, -76.88, 30.914, 111.623, 132.737, -52.575, 6.605, 218.602]

100.863