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.

Ex Input:
[204.235, -53.675, 201.303, 20.869]

Ex Output:
93.183

Ex Input:
[246.282, 231.815, 1.709, -51.234, -76.432, 21.802, 18.917, 106.734, 168.909, -67.647]

Ex Output:
60.085

Ex Input:
[79.82, 218.225, 156.585, 21.813, 181.413, 118.767, -40.274]

Ex Output:
105.193