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: [26.08, 56.924, 53.698, -11.336, -23.002, 61.614, 166.067, 117.058, 71.9, -0.328]

51.867