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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