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.

Example Input: [169.922, 249.47, 142.453, -55.768, 155.357, 6.096, -95.702, 243.569, 31.11, -75.031]
Example Output: 77.148

Example Input: [93.34, 211.631, 173.556, -91.68, 236.096]
Example Output: 124.589

Example Input: [244.419, -61.765, 220.149, 17.181, 153.907, 139.413, 116.16, -63.947]
Example Output:
95.69

