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.

[203.45, 193.726, 199.582, 32.046, 74.008, 170.209, 121.427, -33.882, 78.136, -8.04]
103.066

[209.13, -12.632, 247.489, 55.492, 8.967, -90.158, 193.743]
87.433

[-47.917, -46.834, 56.498, 201.571, -36.733, -64.537, 87.826]

21.411