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Binomial Distribution Math help?
I've forgotten my calculator at home but I've written this out long hand and need to check if my answer is correct.
Here's the problem
Seven percent of Americans have type O- blood. You randomly select 30 Americans and ask them if their blood type is O-.
Find the probability that exactly 10 people say they have type O- blood.
2.95922453935429E-05
Is this right? Thanks!
Whoops thanks I see what I did. you're right thanks.
1 Answer
- ??????Lv 79 years agoFavorite Answer
P = C(30,10) 0.07^10 0.93^20
= (30!/(20!10!)) 0.07^10 0.93^20
= 1.98798 * 10^-5
