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: [214.156, 31.606, -72.608, -59.799, -54.565, 28.815, 62.658, 165.368, -63.207, 35.462]

28.789