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probability+

by mjjking » Tue Feb 24, 2009 9:05 am
9. The probability of pulling a black ball out of a glass jar is 1/X. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/Y. What is the probability of breaking the jar?

1/(XY).
X/Y.
Y/X.
1/(X+Y).
1/(X-Y).
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by willbeatthegmat » Tue Feb 24, 2009 9:11 am
let probability of breaking the jar =1/z
probabilityof pulling a black ball out of a glass jar and breaking the jar= 1/x * 1/z=1/y
1/z= x/y

ans b

pls confirm me the answer
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by dendude » Tue Feb 24, 2009 10:14 am
The answer should be X/Y
Using the "And" rule in Prob which is the multiplication of the individual probabilities.
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by petra » Tue Feb 24, 2009 10:57 am
x/y
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by mjjking » Tue Feb 24, 2009 12:03 pm
yes guys, answer is x/y

good job!
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by welcome » Tue Feb 24, 2009 1:20 pm
1/X * P = 1/Y
P=X/Y
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