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: [228.732, 0.864, -96.117, 185.198, -76.082, 157.171, 93.798, 235.564, 81.912, -18.661]

79.238