Re: Probability

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: Probability
From: William Rickman <RickmanW@SCC-FL.COM>
Date: Tue, 6 Mar 2001 13:58:38 -0500
Reply-To: William Rickman <RickmanW@SCC-FL.COM>

  This is an example of a binomial probability.
  The formula is (nCx) (p^x) (q^x)  where n=10, x=4, p=.55 and q=1-p=.45  . This will give 0.159567755177.
  



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I've been wracking my brain (?!?) and can't come up with the answer to a probability problem:
 
In a certain country, 55% of babies born are boys.  10 babies are born on Jan. 1.  What is the probability that exactly 4 of them are boys?
 
 
The answer is 16%, but I have only come up with 64%.
 
The way I tried was this:   the probability of the first four being boys is (.55)(.55)(.55)(.55) or .0915.
 
Now what?
 
Steve Muthler
Jersey Shore (PA) High School
 

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