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: [71.633, 199.431, 81.125, 113.778, 166.765, -88.713, 114.855]

94.125