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: [157.264, -70.245, -61.063, 5.07, 124.781, 203.599, 105.344, 174.924, 202.512, -82.565]

75.962