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: [-85.623, 231.544, 191.775, 27.471, 44.249, 23.857, 116.214]

78.498