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: [-8.294, -57.878, 203.902, -7.566, 240.642, 116.681, 198.337, 147.024, 138.21, -37.821]

93.324