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.

[209.13, -12.632, 247.489, 55.492, 8.967, -90.158, 193.743]
87.433

[237.861, 119.858, -8.107, -30.075, 180.524]
100.012

[16.516, 69.711, 131.31, -46.718, 246.068, 197.225, 165.816]

111.418