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: [-49.246, -51.453, -22.548, 204.834, 87.783, 116.318, 239.339, -26.778, 114.626, 148.164]

76.104