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.
[2.907, 237.739, 37.725, 104.981, -41.367, 54.094, 5.597, 213.723]