Ok, this seems like an easy enough problem, but I'm stumped...(adsbygoogle = window.adsbygoogle || []).push({});

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If a motorcycle driver is selected at random from the US population, the probability of that driver being a male is 0.95

If 20 motorcycle drivers are selected at random from the population, what is the probability thatexactly8 will be women? What is the probability thatat least8 will be women?

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I've got that the chance of selecting a female is 1/20. And because the population is so large I can treat the events as independent.

I can easily find the probability of selecting 8 women in a row. What's throwing me off is the fact that there are 20 selections, so I know that the probability of selecting 8 total isn't going to be the same as selecting 8 in a row. I can't figure out how to account for the fact that 20 selections increases the probability of 8 women being selected.

I'm also thrown off by the at least 8 vs. exactly 8 part of the problem.

Any hints would be great. Thanks!

-GeoMike-

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# Homework Help: Help with a simple probability problem

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