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: [29.816, 192.957, -93.778, 52.077, -91.487, 13.531, 102.884]

29.429