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: [157.337, 167.818, 247.357, 28.016, -62.002, 240.373, 233.009, 50.509, 169.829, 161.954]

139.42