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: [234.843, 52.306, 40.85, 227.132, 192.94, 68.671, -99.124, 169.261, -89.051, -10.679]

78.715