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.

[171.805, 71.031, 36.192, 28.948, -58.045, 53.843]
50.629

[74.601, 131.018, -45.91]
53.236

[165.23, 195.547, -63.853]

98.975