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#1 2012-12-17 10:30:58

Al-Allo
Member
Registered: 2012-08-23
Posts: 294

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

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#2 2012-12-17 10:49:55

anonimnystefy
Real Member
From: The Foundation
Registered: 2011-05-23
Posts: 15,544

Re: probability

5/32 is correct.


“Here lies the reader who will never open this book. He is forever dead.

“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

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#3 2012-12-17 10:55:28

Al-Allo
Member
Registered: 2012-08-23
Posts: 294

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 !

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#4 2012-12-17 11:01:24

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,426

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

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#5 2012-12-17 11:29:13

Al-Allo
Member
Registered: 2012-08-23
Posts: 294

Re: probability

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

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#6 2012-12-17 12:16:56

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,238

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.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#7 2012-12-17 15:08:50

Al-Allo
Member
Registered: 2012-08-23
Posts: 294

Re: probability

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

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