SOLUTION: What are the odds of having 9 grandsons and no granddaughters?
There's a 10th on the way. What are the odds of the 10th being a girl?
Algebra ->
Probability-and-statistics
-> SOLUTION: What are the odds of having 9 grandsons and no granddaughters?
There's a 10th on the way. What are the odds of the 10th being a girl?
Log On
Question 826069: What are the odds of having 9 grandsons and no granddaughters?
There's a 10th on the way. What are the odds of the 10th being a girl? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! What are the odds of having 9 grandsons and no granddaughters?
P(9 of 10 boys) = 10C9(1/2)^10 = 10*(1/1024) = 10/1024
----
P(not having 9 of 10 boys) = 1014/1024
-----
Odds for 9 of 10 boys = P(of)/P(not of) = 10:1014
---------------------------------------------------
There's a 10th on the way. What are the odds of the 10th being a girl?
P(girl) = 1/2
P(not girl) 1/2
---
odds of girl = P(of)/P(not girl) = 1:1
----------------
Cheers,
Stan H.
========================
(