Probability


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Probability



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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