In: Operations Management
introduces the concept of probability and defines it. We
frequently use probability in our daily lives to make decisions
when we are not sure about the outcome. Read the following
mind-boggling famous problem and decide.
“The Monty Hall problem" is a famous probability related conundrum
faced by participants on the game show Let’s make a deal that
premiered in 1963 and is still running some markets around the
world. At the end of each day’s show, a contestant was invited to
stand with host Monty Hall facing three big doors: Door no. 1, Door
no.2, and Door no.3. Monty explained to the contestant that there
was a highly desirable prize behind one of the doors and a goat
behind the other two doors. The player chose the three doors and
would get a prize whatever was behind it. The initial probability
of winning was straight forward. There were three two goats and one
car. As the participant stood facing the doors with Monty, he or
she had a 1 in 3 chance of choosing the door that would be opened
to reveal the car. However, Let’s make a deal that had a twist,
which is why the show was immortalized in the probability
literature. After the contestant chooses a door, Monty would open
one of the two doors that the contestant had not picked, always
revealing a goat. At that point, Monty would ask the contestant if
he would like to change his pick-to switch from the closed door
that he had picked originally to the other remaining closed door.
For the sake of example, assume that the player has chosen Door no.
1. Monty would then open-Door no. 3; the live goat would be
standing there on stage. Two doors would still be closed, nos. 1
and 2. If the valuable prize was behind no. 1, the contestant would
win; if it was behind no. 2, he would lose. But then things got
more interesting: Monty would turn to the player and ask whether he
would like to change his mind and switch doors (from no. 1 to no. 2
in this case). Remember, both doors were still closed, and the only
new information the contestant had received was that a goat showed
up behind one of the doors that he didn’t pick.”
Address the following question in your post:
• Should the contestant switch the door? Make sure to discuss the
reasons why he needs to switch or not switch.
If we analytically evaluate each option based on the probability of winning through choosing the correct door, it is viable for the contestant to switch.
If the contestant does not switch the door and sticks to his initial choice, then there is probability of only 1/3 of choosing the correct door but if the contestant switches the door then there are 2/3 chances of winning. The odds if winning are better when the contestant switches because Monty curates the remaining choices either way.
The basic reasoning behind the probability of winning more while switching is that Monty already is aware about where the car is. So while eliminating the first door he never chooses the door with the car and also curates the rest of the doors, which means even if contestants initially picked the correct door, location of car is still good to change which leaves switching a better bet to win.
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