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.
[68.796, 121.844, 52.463, 241.577, 231.64, 175.658, 99.831]