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.

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

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

[-75.438, -35.122, 150.678, 152.512, 223.812, 135.057, -84.327, 16.438]

60.451