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: [-70.697, 68.691, 143.128, -76.987, 239.679, -43.992, 246.662, -65.474]

55.126