Bart and Lisa are with Marge as she drives to complete errands.
Bart: Mom, how come you didn't do my homework last night?
[Bart waves his page of homework, containing at least five exercises in fraction arithmetic with common denominators.]
In a flashback to when young Homer was in elementary school, his pop quiz bears three arithmetic problems: 1 + 2, 2 + 2, and 3 + 2.
The Simpsons enter the Hall of Probability at the Science Museum, where Marge expects to find exhibits that are more educational than entertaining.
Marge: Finally! Actual science!
They watch a physical demonstration of a normal probability distribution.
[Bart and Lisa groan.]
Homer (to Marge): You did it, baby! You promised no fun, and you delivered!
They watch an animated video titled, "Take a Chance on . . . Probability!"
Video host: Ah, hello there! I am Blaise Pascal, inventor of the probability theory. What are the odds of meeting you here?
[He flips a coin.]
Video host: Excellent, I would say. My friend Silly Squirrel is about to buy a lottery ticket. Silly Squirrel, do you know the probability of winning the lottery?
Silly Squirrel: I don't know.
Pascal: Why, you are more likely to be run over by a car, or be hit by lightning, or murdered by an acquaintance.
[Silly Squirrel suffers all three fates.]
Pascal (to Silly Squirrel’s grave): If you understood probability, you would never play the lottery (laughing).