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: [-66.116, 177.788, -23.418, 245.983, 124.609, 124.261, -66.339, 71.088, 41.044, 150.689]

77.959