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.

[-1.31, 169.522, -26.172, 111.289]
63.332

[145.697, -40.957, -46.926, -55.065, 177.211, 204.811, -94.192, -47.466]
30.389

[165.757, 109.854]

137.806