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: [59.61, -89.334, 157.475, 196.944, 233.59, 70.205, 75.641]

100.59