# pre statistics

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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 -

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 -

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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