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.

[207.165, 246.399, 44.821, -21.671]
119.178

[226.287, 114.252, -53.47, 8.606, 234.708, -31.872, 163.615]
94.589

[-63.614, 113.639, 243.844, 172.506]

116.594