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: [161.758, 200.472, 88.298, 149.851, -49.385, 106.684, 154.755]

116.062