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: [-15.484, 222.901, 27.57, 215.344, -7.505, 180.126, 63.08, 39.51, 208.913, 48.561]

98.302