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.

[-79.748, 98.398, 55.667, 77.39, -20.719, 187.168, 142.334, 110.723]
71.402

[80.346, 228.37, 18.978, -42.02]
71.419

[100.339, 221.524, -85.213, 248.83]

121.37