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: [233.84, -38.337, 10.341, 195.901, 68.586, 214.429, 213.823, 88.799]

123.423