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.

[126.177, 120.225, 231.498, 170.694, 34.361, 101.823, -21.468, 234.339]
124.706

[127.522, 232.86, 46.593]
135.658

[21.924, 166.417, 16.458, 157.637]

90.609