Another statistics question(from todays midterm)

[funkguy4]

all i did was 1-.98^4

at least one always means 1 - probability that none will be defective

meingot 7.76%

took all of 3 seconds, but i'm prolly wrong. i saw 8% elsewhere in this topic, so i hope they just rounded the answer they got and that it was same as mine

[gummyAvenger]

It's not 8%. By that logic, if you have 1000 units, and you only pull out 50 units, then your chances of getting a defective one are 100%.

[pyrate83]

I'm sorry to have brought everyone into this. I'll just have to let you know what the answer is when I get the test back.

[gummyAvenger]

I don't think you can get the answer without more information. What if the total number of items was 4? Then the probability would be 100%. The probability would be totally different if there were 100 items.

I'm probably wrong, but it seems like they just threw in the 2% to throw you off. Does this make sense:

4 items and 4 selected, so probability = 100%
8 items and 4 selected, so probability = 50%
16 items and 4 selected, so probability = 25%

Therefore, probability = (4 / total number of items).

Then again, I guess that doesn't hold water because if probability of an item being deffective is 100%, then if there are 8 items and 4 are selected, the probability of getting a defective item would always be 100% and not 50%...

This is going to be driving me nuts until I figure it out... when you get the solution, please see if you can also get how to arrive at the solution

[pyrate83]

No problem, I will post the solution and the steps to getting there as soon as I know anything.

[gummyAvenger]

I think I have the answer... I cheated though. I asked my engineer dad

He says probability is a tricky subject and it usually depends on how you look at it, but the way he would do it is this... If 2% of the widgets would be deffective, then he would take 2% of the 4 that were selected... which would give you %0.08 probability.

[pyrate83]

Hmm I see.

[ViRaL1]

I think I have the answer... I cheated though. I asked my engineer dad

He says probability is a tricky subject and it usually depends on how you look at it, but the way he would do it is this... If 2% of the widgets would be deffective, then he would take 2% of the 4 that were selected... which would give you %0.08 probability.

For any one widget you grab, there's a 1 in 50 (or 2%) chance it will be defective. How do you lessen your chances by having more opportunities (more widgets) for defective ones?

[Capmaster]

I think I have the answer... I cheated though. I asked my engineer dad

He says probability is a tricky subject and it usually depends on how you look at it, but the way he would do it is this... If 2% of the widgets would be deffective, then he would take 2% of the 4 that were selected... which would give you %0.08 probability.

For any one widget you grab, there's a 1 in 50 (or 2%) chance it will be defective. How do you lessen your chances by having more opportunities (more widgets) for defective ones?

You don't. 1 in 50 is 0.02 probablilty. With four widgets it then becomes 4-in-50, or 0.08 probability ...or 8%

[ViRaL1]

That I can see, maybe %0.08 was a typo. I actually said 1 out of 12.5 somewhere up there.

[Capmaster]

That I can see, maybe %0.08 was a typo. I actually said 1 out of 12.5 somewhere up there.

Yes it was a typo. I'm sure he meant "0.08" since 0.08% would be the same as 0.0008 probability

[Ripper2860]

Capmaster -- my little huckleberry !!

[Capmaster]

<slurred>"Why Ripper .....whatever do you mean?"

[Ripper2860]

Why Capmaster --

I've always harbored deep and secret feelings for you ...



Dammit!!! I actually meant to post this in the "Poster Above You" thread!! And no -- I have not been drinking!


Perhaps I should start.


Could you move it there -- perhaps in the appropriate thread it won't look so damn spontaneous and gay !!

[Capmaster]

And I thought we were just throwing out quotes from Tombstone

I never knew you felt that way .....wait ...I didn't mean to word it that way

I always thought there was that special something between us. I always pretended to be attracted to tgpo, but it was always you. You thtudly, thweaty beatht you

And, no, I can't take posts from one thread and tack them onto another thread. I can only split them off into their own thread. I hope you're not mad at me ....

[ViRaL1]

Why Capmaster --

I've always harbored deep and secret feelings for you ...



Dammit!!! I actually meant to post this in the "Poster Above You" thread!! And no -- I have not been drinking!


Perhaps I should start.


Could you move it there -- perhaps in the appropriate thread it won't look so damn spontaneous and gay !!

And I thought we were just throwing out quotes from Tombstone

I never knew you felt that way .....wait ...I didn't mean to word it that way

I always thought there was that special something between us. I always pretended to be attracted to tgpo, but it was always you. You thtudly, thweaty beatht you

And, no, I can't take posts from one thread and tack them onto another thread. I can only split them off into their own thread. I hope you're not mad at me ....

Now where's that Lone Ranger pic I keep seeing?

[Capmaster]

[ViRaL1]

That'd be it.

[Capmaster]

I feel so ...so ...dirty

[ViRaL1]

I'll take your word for it. I'm not gonna see for myself.