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.

[85.354, -22.629, 51.171, 238.376, 177.126, -90.135, -84.086, 175.426, -80.74]
49.985

[204.235, -53.675, 201.303, 20.869]
93.183

[-91.531, 115.044, -34.155, 178.455, 0.682, 90.689, -60.965, 15.051, 224.379]

48.628