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.

Let me give you an example: [1,3,5]
The answer to this example can be: 3.000
Here is why: The mean of the input list is (1+3+5)/3, which equals 3. This is a good example.

OK. solve this:
[213.816, 178.027, 65.849, -91.646, 174.169, -12.033, 48.904, 148.142, 220.714, 218.252]
Answer:
116.419