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.

[172.084, 126.948, 90.757]
129.93

[223.951, 2.518, 140.336, -38.799, 217.497, 212.153, 21.874]
111.361

[142.928, 11.272, 10.768]

54.989