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: [114.642, 144.995, 186.404, 230.143, 103.845, 159.661, 118.066, 134.424, -10.966, 114.294]

129.551