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: [212.748, 1.108, -28.847, 82.706, 87.593, 188.959, -46.088]
A: 
71.168