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: [69.026, 152.794, 185.336, 194.504, -77.114, 154.703, -84.573, 199.655, 43.948, 239.687]

107.797