h = {"Адам" => 10, "Микита" => 12, "Шаміль" => 5, "Герц" => 9, "Шандор" => 6}
s = 0
h.each do |name, mark|
  h[name] = rand 0...12
  s += h[name].to_f
end
a = s / h.length.to_f
print("#{h}\n")
print("#{a}\n")
good_boys = []
h.each do |name, mark|
  if mark > a
    good_boys.push(name)
  end
end
print("#{good_boys}\n")