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: [95.27, -77.753, -67.765, 18.886, -10.443, 183.369, 42.658, 119.415, -36.86, 158.802]

42.558