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

Al-Allo
Member
Registered: 2012-08-23
Posts: 293

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: 15,392

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: 293

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: 6,311

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: 293

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: 84,597

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.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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

Al-Allo
Member
Registered: 2012-08-23
Posts: 293

Re: probability

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

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