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: [213.956, -58.844, 121.865, 74.913, 140.774, 61.082, -72.239, 191.941, 37.032, 238.012]

94.849