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.
Q: [238.505, 172.937, 68.753, 120.888, 86.228, 147.471, -63.624, 50.577, 99.186]
A: 
102.325