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: [197.314, 108.282, 77.687, -91.919, -2.084, 245.978, 150.625, 111.613, 88.383]

98.431