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: [178.931, 227.744, -94.385, 227.269, 27.205, -93.034, 243.507]

102.462