Definition: 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.
Input: [-75.807, 244.532, -47.644, 139.007, -77.132, 245.45, 5.393, -43.568]

48.779