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: [148.542, 57.242, 56.249, 73.5, -52.503, 40.315, 161.959, 143.14, 186.95, -29.613]
Output:
78.578