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: [121.474, 19.247, 219.886, 114.484, 247.174, -75.551, 50.376, 83.968, 23.265, 114.9]

91.922