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.

[91.408, 178.508, 77.081, 13.419, 185.372, 158.828]
117.436

[94.752, 94.081, 191.426]
126.753

[72.369, 166.749, 213.343, 246.021, 190.294, -91.645, -31.149, 157.844]

115.478