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: [52.056, -90.393, -58.882, 147.557, 243.623, 102.79, 5.508, 107.879, 107.174, 141.679]

75.899