Posted by Angela on Friday, February 6, 2009 at 8:58am.
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

math,pre statistics  Reiny, Friday, February 6, 2009 at 9:38am
U is underweight, N is notunderweight
a) so you want UUUU = (.18)(.18)(.18)(.18)
= .18^4 = .00105
b) wouldn't that be all notunderweight ?
or (.82)^4 = .45212
c) at least one underweight implies
1  Prob(all nonoverweight)
= 1.45212
Since there are only 5 cases possible, I will do each one to show the logic of the above
none underweight = (.82)^4 = .45212
1 underweight = C(4,1)(.18)(.82)^3 = .39698
2 underweight = C(4,2)(.18)^2(.82)^2 = .13071
3 underweight = C(4,3)(.18)^3(.82) = .01913
4 underweight = (.18)^4 = .00105
notice if we total this we get 1

math,pre statistics  Regina, Friday, February 6, 2009 at 8:29pm
Two dice are rolled. What is the probability that it is not doubles?
Answer This Question
Related Questions
 pre statistics  In a recent health study it was claimed that 18% of americans ...
 probability  in a health study, 18% of americans are underweight. If 4 ...
 statistics  if 18% of all Americans are underweight, find the probability that ...
 Statistics  A consumer protection group reports that 25% of 5lb bags of sugar ...
 Health  Bulimia can be difficult to discover because most sufferers hide there ...
 MATH  In a study 42% of adults questioned reported that their health was ...
 Health  The U.S. government categorizes body weight status as ________. A. ...
 Health  The U.S. government categorizes body weight status as ________. A. ...
 Health  The U.S. government categorizes body weight status as ________. A. ...
 health  The U.S. government categorizes body weight status as A. Healthy, ...
More Related Questions