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: [234.671, 141.166, 27.945, -37.672, 17.846, 172.972, 89.249]

92.311