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.

[245.271, 40.965, 133.913, 212.104]
158.063

[-44.354, 8.74, 34.514, 207.685]
51.646

[64.888, -11.271, 104.506, 220.041]

94.541