Posted by **Lisa** on Monday, October 1, 2012 at 9:32pm.

in a health study, 18% of americans are underweight. If 4 americans are randomly selected, what is the probability that at least one will be underweight?

- probability -
**Reiny**, Monday, October 1, 2012 at 9:42pm
prob(underweight) = .18

prob(NOT underweight) = .82

Prob(at least one underweight)

= 1 - prob(all 4 not underweight)

= 1 - .82^4

= .5478..

or appr 55%

here is a more detailed version of your question back from 2009

http://www.jiskha.com/display.cgi?id=1233928692

- probability -
**Lisa**, Tuesday, October 2, 2012 at 10:04am
Thank you so much for taking the time to help me.

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