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: [1.826, -13.578, 29.756, 119.525, -85.049, 91.151, 154.453, 62.028, 167.714, -30.166]

49.766