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: [212.956, 185.858, 185.03, 95.708, 217.62, 243.52, 192.315, 35.864, -84.186, 93.102]

137.779