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#1 2010-09-15 03:10:29
- samuel baffoe
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probability
1) A man is given n keys, in random order of which only one will unlock his door. He tries them one by one (without replacement). find P(man succeeds on k*th trial)
#2 2010-09-15 06:35:12
- bobbym
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Re: probability
Hi Sam;
A question for you, you have posted several other questions.
I don't know whether or not you needed help or you were just posing a problem.
I answered them, can you check them and tell me what you think?
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.
#3 2010-12-12 14:00:48
- noemi1982
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Re: probability
una clase consta de 14 hombres y de 30 mujeres de los cuales la mitad de los hombres y la mitad de las mujeres usan anteojos. Hallar la probabilidad de que una persona escogida al azar 1) sea hombre 2) use anteojos 3) sea hombre y use anteojos.
probabilidad por medio de Laplace
#4 2010-12-12 14:03:31
- noemi1982
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Re: probability
en un experimento se tira 4 veces seguida una ficha de 2 caras, una roja y la otra blanca. calcular la probabilidad de:
1/ obtener exactamente una cara roja
2/ por lo menos una cara roja
3/ ninguna cara roja. hacer el conteo de los casos
#5 2010-12-12 14:20:20
- bobbym
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Re: probability
Hi noemi1982;
noemi1982 wrote:
una clase consta de 14 hombres y de 30 mujeres de los cuales la mitad de los hombres y la mitad de las mujeres usan anteojos. Hallar la probabilidad de que una persona escogida al azar 1) sea hombre 2) use anteojos 3) sea hombre y use anteojos.
probabilidad por medio de Laplace
Welcome to the forum! I do not understand what you mean by the method of Laplace.
Here are my answers:
1) P( is a man ) = 14 / 44
2) P(wears spectacles) = 1 / 2
3) P( is a man and uses spectacles ) = 7 / 44
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.
#6 2010-12-12 14:43:53
- noemi1982
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Re: probability
regla de Laplace: se aplica cuando los "n" resultados son equiprobables.
P(A)= numero de caso favorable / numero de casos posibles
#7 2010-12-12 14:49:53
- bobbym
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Re: probability
Hi;
I understand. Then my answers in post 5 are correct, if I am translating correctly. I hope so.
I use P = successes / ( successes + failures ).
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.
#8 2010-12-12 15:08:06
- noemi1982
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Re: probability
en un experimento se tira 4 veces seguida una ficha de 2 caras, una roja y la otra blanca. calcular la probabilidad de:
1/ obtener exactamente una cara roja
2/ por lo menos una cara roja
3/ ninguna cara roja. hacer el conteo de los casos
thank 
#9 2010-12-12 16:18:50
- bobbym
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Re: probability
Hi;
I am sorry, I was able to understand your other posts because I had my brother to help translate. I do not understand spanish as well as he does. I think you are saying you flip a card 4 times and one side is red and the other side is white? Am I close?
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.
#10 2010-12-13 02:10:48
- noemi1982
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Re: probability
In an experiment if you throw a double faced chip four times in a row with one face red and the other white.
Calculate the probability of:
1/exactly getting a red face
2/getting at least one red face
3/get no red faces
account the cases.
thanks
#11 2010-12-13 04:29:51
- bobbym
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Re: probability
Hi noemi1982;
Thanks for translating for me. I am learning a little spanish but I am a slow learner. I am going to assume that the probabilities of either face are equal.Okay we have a binomial experiment.
1) P(getting 1 red face) = 1 / 4
2) P(getting at least 1 red face) = 15 / 16
3) P(getting 0 red faces) = 1 / 16
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.