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: [-91.008, 169.514, 49.749, 150.994, -11.229, 187.64, 162.395, 243.206]

107.658