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.
[166.878, 68.781, -94.418, 245.98, 38.679, 199.166, 7.332, 233.425]