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:
[138.602, 158.458, 241.327, 194.509, 169.45, -56.151]

Ex Output:
141.032


Ex Input:
[21.531, 221.161, -31.194]

Ex Output:
70.499


Ex Input:
[-98.53, 120.603, 65.556, 145.984, -5.08, 16.496, 89.726]

Ex Output:

47.822