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: [-26.183, 53.059, 40.287, 243.387, 22.271, 21.177, 45.84, 77.377, 7.971, 119.368]

60.455