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: [153.936, 68.919, -78.569, 71.736, -4.739, 35.463, 175.293, -1.864, 128.619, 151.806]

70.06