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: [-26.29, 238.476, 82.716, 207.42, 115.114, 160.713, -43.172, 118.205]

106.648