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: [233.848, -58.713, 126.623, 27.615, 62.365, 200.239, 13.38]

86.48