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: [179.46, 15.254, 229.089, 17.086, 21.016, 43.478, 162.183, -77.907, 114.296]

78.217