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: [241.486, -13.877, 1.808, 200.765, 223.234, -42.449, 127.587, 78.763, -80.96, -58.717]

67.764