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: [20.3, 232.812, -49.748, 205.222, 110.007, 21.877, 183.686, 191.009]

114.396