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: [242.136, 31.826, -28.3, -15.049, -67.016, 215.252, 176.8, 30.502]

73.269