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How to solve probability without standard deviation given?

Lung Cancer discussions, another of the most common forms of cancer

How to solve probability without standard deviation given?

Postby birdhil36 » Thu Jan 01, 1970 12:00 am

How to solve this? Im just used to x-mean/std. This one is completely different. Thanks.

Lung Cancer accounts for 31% of somking related deaths. If 12 smoking related deaths are randomly selected, what is probability 3 of them will show lung cancer?
Answer is supposed to be 0.2323
How to solve this? Im just used to x-mean/std. This one is completely different. Thanks.

Lung Cancer accounts for 31% of somking related deaths. If 12 smoking related deaths are randomly selected, what is probability 3 of them will show lung cancer?
Answer is supposed to be 0.2323
birdhil36
 
Posts: 392
Joined: Wed Oct 03, 2012 10:17 pm

How to solve probability without standard deviation given?

Postby kegan » Tue Oct 16, 1984 6:01 pm

Hint: what is the probability that 3 lung-cancer deaths happen in a row, followed by 9 other deaths in a row, in that exact order?

Next hint: how many permutations are there in which 3 of the deaths are caused by lung cancer and 9 are not? (Caution: think of this as 3 identical objects and 9 identical objects. Don't blindly use the permutation formula just because I said permutations.)

That first probability was for a specific order (one individual permutation). Each permutation has the same probability, so you just multiply that probability by the number of permutations and that's the answer.

The answer actually should round to 0.2324
kegan
 
Posts: 1081
Joined: Sat Apr 02, 2011 12:16 am

How to solve probability without standard deviation given?

Postby lynne » Thu Apr 18, 2013 6:24 pm

How to solve this? Im just used to x-mean/std. This one is completely different. Thanks.

Lung Cancer accounts for 31% of somking related deaths. If 12 smoking related deaths are randomly selected, what is probability 3 of them will show lung cancer?
Answer is supposed to be 0.2323
lynne
 
Posts: 1023
Joined: Sat Apr 02, 2011 3:02 am


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