# A ruby program for finding average mean

module AverageMean
  # Average mean = sum of elements / total number of elements
  def self.average_mean(n, *array)
    if n.instance_of? Integer
      if n == array.size
        puts "The average mean of the following elements #{array} is #{array.sum / array.size}."
      else
        puts "Provide the required #{n} elements properly!"
      end
    else
      raise
    end
  rescue StandardError
    puts 'Error: Please provide number only!'
  end
end

# Valid inputs
AverageMean.average_mean(2, 3, 1)
AverageMean.average_mean(5, 1, 2, 3, 4, 5)
AverageMean.average_mean(3, 2, 2, 2)

# Invalid inputs
AverageMean.average_mean(2, 3, 1, 5)
AverageMean.average_mean(2, 3, 'a')
AverageMean.average_mean('a', 1, 2)