gistfile1.txt

class Student
  attr_accessor :scores, :first_name


  def initialize(student = {})
    @scores = student["scores"]
    @first_name = student["first_name"]
  end

  def average_score
    scores.inject{|sum, score| sum + score} / scores.length
  end

  def letter_grade(grade = self.average_score)
    lookup_letter_grade = {10 => "A", 9 => "A",8 => "B", 7 => "C", 6 => "D"}
    if grade < 60
      return "F"
    else
      return lookup_letter_grade[grade / 10]
    end
  end

end

  students = Array.new
  students << Array.new(1){Student.new("scores" => [100,100,100,0,100], "first_name" => "Alex")}
  students << Array.new(1){Student.new("scores" => [100,100,100,0,100], "first_name" => "Penelope")}
  students << Array.new(1){Student.new("scores" => [100,100,100,0,100], "first_name" => "Ninja")}
  students << Array.new(1){Student.new("scores" => [100,100,100,0,100], "first_name" => "Rainbow")}
  students << Array.new(1){Student.new("scores" => [100,100,100,0,100], "first_name" => "Cloud Rider")}



p students[0].first_name == "Alex"
p students[0].scores.length == 5
p students[0].scores[0] == students[0].scores[4]
p students[0].scores[3] == 0

gistfile2.txt

line 34 <main>': undefined method `first_name' for #<Array:0x007f83f2161e80> (NoMethodError)