Homework Help: probability

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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