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: [-26.745, -76.789, 118.385, -84.702, -67.839, 178.479, 134.875]

25.095