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: [84.074, 36.545, 74.236, -44.079, 183.305, 141.542, -77.383, 53.848, -18.09, 146.092]

58.009