Homework Help: pre statistics

Posted by Angela on Thursday, February 5, 2009 at 10:23pm.

In a recent health study it was claimed that 18% of americans are underwieght.If 4 americans randomly selected what is the probability that

a. that all will be underweight
b.none will be underweight
c. at least one will be underweight

pre statistics - bobpursley, Thursday, February 5, 2009 at 10:45pm
pr(a.)=18/100*18/100*18/100*18/100

I will be happy to check the others. On the last, remember there are four ways the combination can occur
- pre statistics - bobpursley, Thursday, February 5, 2009 at 10:48pm
  Sorry, on the last, you could have
  
  4 ways to have one underweight
  UFFF, FUFF, FFUF, FFFU
  Ways to have two U
  UUff, UfUf, UffU, FUUf, FUfU, FfUU
  Ways to have three U
  UUUf, UfUU, FUUU, UUfU
  Ways to have four U.
  UUUU

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