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.

[74.601, 131.018, -45.91]
53.236

[138.602, 158.458, 241.327, 194.509, 169.45, -56.151]
141.032

[44.634, 6.553]

25.594