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: [51.585, 216.06, 90.446, 240.165, 72.333, -41.801, -67.933, 75.671]

79.566