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Please read this from the bottom up!

Tom Short wrote:

No, you can't figure out the right answer in that problem unless you know P(A and B).

Tom Short
tshort@iup.edu

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Dana Stephens wrote:

I had that you can not have a probability of over 1 but I thought we also had to figure out the right answer. Do we have to figure out the right answer?

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Tom Short wrote:

Hi Dana,

I think that the key to 17 (b) is to look at the last phrase, where it says that the final probability is 1.30.

You are correct that you would need P(A and B) to compute the correct exact answer, but you should be able to say why 1.30 cannot possibly be the correct answer.

I hope this helps. Please let me know if you have other questions.

Tom Short
tshort@iup.edu

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Dana Stephens wrote:

I have been having problems with number 17. 16 I understood perfectly fine.

For #17b. how do I figure out the P (A and B). To figure out the problem the equation would be P ( A union B)

= P (A) + P (B) - P (A and B)
P (A) would be 8/10 and the P (B) would be 5/10. That is all I can figure out. Am I right so far?

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Tom Short wrote:

Hi Dana,

Thanks for the message. I'm not sure if you are out of your mind, but part (a) is not true.

Think about how many people live in Pennsylvania compared with other states. That is my hint.

Please let me know if you are still stuck on this one or if you have any other questions, and have a good weekend.

Mathematically yours,

Tom Short
tshort@iup.edu

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Dana Stephens wrote:

I was doing my homework and I had a question on number 17 on page 499. Is this a trick question. To me letter a is true. Am I out of my mind or is that true.

Thanks!
Dana

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