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: [16.516, 69.711, 131.31, -46.718, 246.068, 197.225, 165.816]

111.418