The Fair Card Trick: Probability comic video

0:00 LearnFun Comics. The Fair Card Trick. A deck full of surprises!

0:05 Cardville. Momo plays in the park.

0:08 I’ll count the cards. Easy peasy!

0:11 This card game looks fair. But it’s not.

0:14 I count. 50 cards. 48 win?

0:17 Winning cards

0:19 Count all cards first. Winners from total divide. Chance of winning found

0:24 I count all cards, then winners. Probability tells me my chances!

0:29 Not 48. More like 40!

0:31 I count 50 cards. 40 win. That’s 40 winners ÷ 50 cards = 0.8

0:38 40 ÷ 50 = 0.8. 0.8 = 80% chance. I win 80% of the time!

0:47 Remember these

0:49 Probability = Winners ÷ All cards. Always divide to find it. Percentage is 100 times the result

0:57 Always divide winners by all cards. Then multiply by 100 for percent!

1:02 Your turn, hero! Momo has 15 cards. 12 win. What’s the chance as a %? A: 20%. B: 40%. C: 60%. D: 80%

1:18 The answer is 80%. 12 ÷ 15 = 0.8. 0.8 × 100 = 80%

1:27 Gee, Momo, 1 minus 20% wins. 80% lose! Gasp

1:32 24 cards. 18 win. What’s the %? A: 60%. B: 65%. C: 70%. D: 75%

1:47 The answer is 75%. 18 ÷ 24 = 0.75. 0.75 × 100 = 75%

1:57 The final battle If 5 cards win, how many must be total for 20% to win? A: 30. B: 35. C: 40. D: 25

2:13 The answer is 25. 5/total = 20/100 , becomes, total = 5 × 5 = 25

2:21 You get 80%! Losing is 100%-80! 12 cards win! Boo

2:28 12 of 15 cards win. 12 ÷ 15 = 0.8, so that is 80%!

2:34 Cards in the deck, safely saved.

2:37 Remember. Probability = Winners ÷ All cards Divide winners by all cards Multiply by 100 for percentage

2:46 But where are Baron Blunder’s cards from? Hmmm

2:49 Read this comic and answer the questions yourself, at learn fun dot in.