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: [132.337, 22.984, 134.637, -86.549, 21.826, 186.962, 51.9, 247.067, 27.577, 242.599]

98.134