TASK DEFINITION: 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.
PROBLEM: [-40.246, -7.512, 174.245, -98.6]

SOLUTION: 6.972

PROBLEM: [114.041, 53.494, 14.751, -0.392, -70.081, 116.8, 1.044, -50.731]

SOLUTION: 22.366

PROBLEM: [67.487, 242.093, 105.788]

SOLUTION:
138.456