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: [247.226, -80.192, -32.113, 26.5, 247.758, 214.918, 54.096]

96.885