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.

[244.1, -84.018, 7.772, 69.273, 99.397, 158.691, -0.315]
70.7

[4.435, 100.482, 125.267, -76.982, 9.994, 192.069, 54.099, -40.749]
46.077

[27.929, 172.413, -97.533, -21.764, 119.338, 247.986, 76.266]
74.948