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: [193.506, 145.362, 144.533, -14.497, 22.442, -5.632, -5.134]

68.654