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: [97.043, 224.423, -6.879, 167.24, -90.61, 23.426, -27.015, 170.109]

69.717