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.

Ex Input:
[22.306, 72.768, 218.947, 52.973, 100.121, 157.59, -92.109]

Ex Output:
76.085


Ex Input:
[206.606, -76.103, -16.863, 44.126, 4.019, 15.088]

Ex Output:
29.479


Ex Input:
[158.637, 34.783, 39.728, -83.123, -51.268, 204.769]

Ex Output:

50.588