gistfile1.rb

def get_average(array)
  sum = 0.0
  result = 0.0
  if array.length > 0 then
    array.each do |item|
      sum += item
    end
    result = sum / array.length
  end
  return result
end

data = [3.5, 4.7, 8.6, 2.9]
average = get_average(data)
puts "The average is #{average}."