Question

Use the data in the following table, which summarizes results from 171 pedestrian deaths that were caused by accidents. If two different deaths are randomly select the replacement, find the probability they both involved intoxicated
drivers.
Pedestrian Intoxicated?
Yes No
Drivers yes 24 34
Intoxicated? No 97 15

I wonder if I have the right formula!!!
Please help me, Thanks!!! ;))

Answer 1

What do you have so far?

Answer 2

P(A and B)=P(A) +P(B)-P(A and B)

Answer 3

Recursive equation?

Answer 4

122/171 + 59/171-34/171

Answer 5

P(A or B)?

Answer 6

By the way, have you learned about mutual exclusiveness and independence?

Answer 7

Ok. How I used it, when P(A or B)??
No, I might have but, I don't remember.

Answer 8

So P(A | B) = P(A) + P(B) - P(A & B) give us P(A & B) = P(A) + P(B) - P(A | B). That's what you meant right?

Answer 9

| for or & for and

Answer 10

Yes!

Answer 11

That will give us the probability for one case.

Answer 12

(By the way, should those number be adding up to 171 or 170)?

Answer 13

Why 170?

Answer 14

24+34+97+15 = 170 also 24+34 = 58

Answer 15

Oohhh!!

Answer 16

Sorry is actually 25 instead of 24.

Answer 17

"If two different deaths are randomly select the replacement,"
Does this mean after we select the death, we can possibly select the same death again?

Answer 18

Ok

Answer 19

It's a question, not a statement.

Answer 20

Ooh! 171

Answer 21

I am trying to solved it

Answer 22

Noo, it's the answer.

Answer 23

The answer is 0.1177
I confuse now..

Answer 24

So 11.77% chance, right?

Answer 25

Do you have anyway to verify the answer?

Answer 26

Nop!

Answer 27

It was a quiz.

Answer 28

So, How you got that? I still don't get it. even though I can do the other one, but this one is tricky.

Answer 29

@rocal2 I think I messed up on it.

Answer 30

The problem is that I don't understand the exact text of the problem.

Answer 31

To be honest, me neither. But let me double check if I messed up in writing.

Answer 32

I'll double check and I didn't messed up a world.

Answer 33

Sorry but the English is a bit bad on the question. That is why my problem is.

Answer 34

I think the answer is [(25+34)/171]^2

Answer 35

But it could be wrong because the question is unclear.

Answer 36

Don"t worry, I have the same situation with English as second language..Is difficult for me too.

Answer 37

Still, not that one..

Answer 38

How about (25+34)/171 * [(25+33)/170 + (24+34)/170]

Answer 39

Nopi!!

Answer 40

I can't do it. I simply don't know what it is asking. Sorry.

Answer 41

It's ok! don't worry. Thanks for trying anyway.. ;))