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: [150.951, 66.358, 18.362, -41.836, 52.778, -3.335, -69.374]

24.843