get_grade

def get_grade(grade)
  average = grade.to_i

  case average
    when 90..100
      "A"
    when 80...90
      "B"
    when 70...80
      "C"
    when 60...70
      "D"
    else
      "F"
  end
end

def get_grade(array)

// this is how to do it with the inject method
average = array.inject(0) { |sum, num| sum += num }.to_f / array.length

case average
when 90..100
puts"A"
when 80...90
puts"B"
when 70...80
puts"C"
when 60...70
puts"D"
when 0...60
puts"F"
else
puts"Error"
end

end