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: [134.479, 106.642, 94.798, 145.971, -88.732, 185.359, 49.87]

89.77