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.

[196.683, 97.538, 247.799, 203.036, 203.369, -15.737]
155.448

[21.953, -90.519, 92.624, 189.808, 130.57, -33.423, -16.126, 31.61, 119.582]
49.564

[134.987, 238.759, -58.041]

105.235