input: Write a python function to find the average of numbers in a list.
  assert findAverage([2, 4, 6, 8, 10]) == 6.0
  assert findAverage([1, 2, 3, 4, 5]) == 3.0
  assert findAverage([10, 20, 30, 40, 50]) == 30.0
output: def findAverage(numbers):
      return sum(numbers) / len(numbers)