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.

[226.383, 37.978, 174.444, 117.212]
139.004

[38.343, 177.478, 120.174, -74.923, 98.159]
71.846

[141.554, 211.997, 146.939, 123.283, -58.205]

113.114