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: [151.463, 163.651, -88.224, 87.7, 218.205, 88.816, 197.676, -18.096, -21.814, 241.262]

102.064