Definition: 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.
Input: [-8.346, 174.481, -50.168, -58.647, 118.544, 134.063, 210.363]

74.327