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.
[130.845, -65.556, 50.948, -82.687, 94.72, 1.398, 191.859]