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.

[102.524, 88.129, 196.972]
129.208

[85.354, -22.629, 51.171, 238.376, 177.126, -90.135, -84.086, 175.426, -80.74]
49.985

[116.921, 17.443, 171.06, 238.514, 55.396]

119.867