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Probability and Statistics

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Presentation on theme: "Probability and Statistics"— Presentation transcript:

1 Probability and Statistics
The Monty Hall Problem Probability and Statistics Probability Theory

2 History September 1991, a reader of Parade asked a question to the “Ask Marilyn” column If you’re on a game show and you can choose one of three doors where there’s a car behind one and a goat behind the other two, after picking a door, would you switch doors after being revealed one with a goat? Is there an advantage? Marilyn Vos Savant responded saying it would be better to switch, and there was a lot of controversy with this response Matthew Carlton, Cecil Adams, and Keith Devlin later gave their reasoning that aligned with Marilyn’s

3 History cont’d This dilemma was named after Monty Hall
Monty Hall was the host of Let’s Make a Deal in the 1960s and 1970s 3 doors are shown and the contestant picks one One door has a car, the other two have nothing A door that wasn’t picked is opened to reveal it’s empty The contestant has a choice to stick with their door or change to the other one

4 The big question…. Should you switch???

5 Explanation The choice isn’t luck but based on probability
1/3 chance of picking the car at the beginning Once a door is eliminated, the chance of winning a car between the last 2 doors is NOT 50-50 Need to look at 2 options: Always switching Always staying

6 Explanation Cont’d Always stay: Always switch:
2/3 chance of picking a door with nothing 1/3 chance of picking the door with the car Always switch: 2/3 chance of picking a door with the car 1/3 chance of picking a door with nothing


8 There is a 2/3 chance of getting the car if you switch.
This means you have a better chance at winning if you switch!

9 References omb/dependent_events_precalc/v/monty-hall-problem s

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