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.

[128.152, 95.16, 70.113, -16.853]
69.143

[93.34, 211.631, 173.556, -91.68, 236.096]
124.589

[179.151, 227.996, 83.825, -76.177, 189.178, 180.917, 233.24, 57.713, -48.965]

114.098