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: [232.334, 98.496, -33.81, -12.743, 147.9, 223.868, 21.898, 9.878, 234.927, 78.978]

100.173