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#1 2010-09-24 17:34:14
- tommy666
- Guest
Probability question i dont understand....help...
Someone rolls a die and then picks cards from a standard deck equal to the number showing on the die.
a) What is the probability that the number of jacks in the hand equals 2?
b) Conditional on knowing the number of jacks in the hand equals 2, what is the conditional probability that the die showed 3?
#2 2010-09-24 22:21:30
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Probability question i dont understand....help...
Hi tommy;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2010-09-25 04:19:44
- tommy666
- Guest
Re: Probability question i dont understand....help...
I don't understand the question...
#4 2010-09-25 06:18:08
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Probability question i dont understand....help...
Hi;
Your question a) I have answered based on this assumption. It says you take a die and roll it. If you roll a 3 you pick 3 cards. If you roll a 5 you pick 5 cards from the deck. The sample space for a die is {1,2,3,4,5,6}. When you roll a 1 you pick 1 card from the deck. Ther probability of having 2 jacks in 1 card is 0. You now figure the probability for all possible rolls. I have given you the answer in post #2, just click a).
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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