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.

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

[-21.77, 172.703, -31.807, 129.587, 84.624, 14.279]
57.936

[99.431, -0.986, -97.815, 83.097, 183.282, 61.416, -26.114, -8.399, -8.236, -67.816]

21.786

