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: [-46.782, 241.624, 201.41, 138.101, 167.039, 228.064, 68.487, -71.501, 249.042, 131.158]

130.664