MathBench > Probability

Mice with Fangs: Intro to Punnett Squares

Punnett Menu Revisited

So the point here is that the Punnett Square just gives us all the possible combinations all two sets of objects / phrases / conditions / whatever. You list one complete set along the top, and the other complete set across the side.

Of course its possible that the two sets might have some elements in common. For example, when I go to the Chez Punnett, I may not care what 2 dishes I eat instead I might just care what they cost. So my square might look like this:

  $24
(Shrimp)

$24
(Trout)

$28 (Gratin) $28
(Turkey)
$37
(Hen)
$13
(Choc Mink)
$37 $37 $41 $41 $50
2. $13
(Choc Cake)
$37 $37 $41 $41 $50
$17
(Popsicle)
$41 $41 $45 $45 $54
$17
(Gelato)
$41 $41 $45 $45 $54
$17
(Croissant)
$41 $41 $45 $45 $54

 

Notice that many meals cost the same amount when totalled up.

If I ordered a meal at random from Chez Punnett,
what is the chance I would end up paying $41?

(To make this problem interactive, turn on javascript!)

I think I have the answer: 40%