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#1 2012-12-18 09:30:58

Al-Allo
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probability

I have just a little question about this : If I toss a coin 5 times, what is the probability of getting 4 tails and 1 head ? I think the answer is 5/32 ? Is this any good ? THanks

#2 2012-12-18 09:49:55

anonimnystefy
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Re: probability

5/32 is correct.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“A secret's worth depends on the people from whom it must be kept.” ― Carlos Ruiz Zafón

#3 2012-12-18 09:55:28

Al-Allo
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Re: probability

Omg im happy to know that because in my book it says its 4/32 ?!? And here is another one, what is the prob that it will land 3 times on head and 2 times on tails ? I got 9/32 but in my book it says 8/32 ?!? There is always 1 of difference, we could say it's an error ? Thanks !

#4 2012-12-18 10:01:24

bob bundy
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Re: probability

hi Al-Allo

Welcome to the forum.

Stay on-line.  I'm just working it out.

1 5 10 10 5 1

It should be 10/32

hhhtt, hhtht, hhtth, hthht, hthth, htthh, thhht, thhth, ththh, tthhh


Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#5 2012-12-18 10:29:13

Al-Allo
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Re: probability

oh yes you're right. i noticed i missed one, so thanks ! finaly, my book wasnt right ! thanks you two !

#6 2012-12-18 11:16:56

bobbym
Administrator

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Re: probability

Hi Al-Allo;

Both of those are binomial distribution problems. What is the name of the book?


In mathematics, you don't understand things. You just get used to them.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.

#7 2012-12-18 14:08:50

Al-Allo
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Re: probability

It's not written in English ... ^^ Even, it's only exercises, nothing more lol

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