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Statistics question on combinations?
Assume that 13% of people are left-handed, and suppose that we select 20 people at random. Find the probability that...
a) the first lefty is the first person chosen
b) There are exactly 5 lefties in a group
c) the first lefty is the second or third person chosen
d) there are at least 3 lefties in the group
e) we must test at least 3 poeple in order to find the first lefty
These have to do with geometric vs. binomial distributions, and I'm lost...
Thanks.
1 Answer
- Anonymous1 decade agoFavorite Answer
a/
0.13
b/
C(20,5) (0.13)^5 (0.87)^15