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: [73.3, 109.762, 214.701, 107.305, 160.889, 218.562, 54.763, 148.637]

135.99