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.

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

[112.53, -67.079, 177.313, 230.482, 57.316, -37.564]
78.833

[247.972, 41.229, 14.158]

101.12