345: Fair or Foul?

Sullivan bought a die at the magic shop. He rolls it 155 times and gets the following results:

• ONE: twenty-eight times
• TWO: twenty times
• THREE: fifteen times
• FOUR: thirty-one times
• FIVE: thirty-two times
• SIX: twenty-nine times.

Is this die loaded?
What is the probability he will get a 6 on the next roll?