Little question (Probability)

Al-Allo · 2013-06-21 08:45:58

could you show me in details my error pls ?

bobbym · 2013-06-21 08:49:55

You are correct here, all three hitting:

0.4*0.3*0.8 because you computed three arrows being fired.

Here you are incorrect
0,4 * 0,3= 0,12 or 0,4*0,8= 0,32 or 0,3*0,8=0,24 you only fired 2 arrows what about the third? The one that missed?

Al-Allo · 2013-06-21 09:01:54

Ok, must I see it that that way

1-No one gets-2 persons don't get it-1 person don't get it- every one gets it- 2 persons gets it- 1 person gets it = 0

???

bobbym · 2013-06-21 09:05:24

Here is how to see it. If you tree these that is when you see the errors quickly. I will give you another approach

h means hit and m means miss. There are 3 2 hits and 1 miss. Do you see them?

For instance Tom hits, Alice hits and Julie misses. To get the probability for that just fill in

Tom = h = .4
Alice = h = .3
Julie = m = .2

.4*.3*.2 = .024

You do the other 2 and add them up

Al-Allo · 2013-06-21 09:15:31

AH......... ok, Sh... I should have done a drawing to help me see it. Ok, now, I know how to finish do it.

Here's, in the ordrer of the diagramm, the probabilities :

0.096+0.024+0.224+0.056+0,144+0,036+0,336+0,084=1

GOOD!
Thank you bobbym, I've learned from it !

bobbym · 2013-06-21 09:19:01

Hi;
Did you calculate using the m's too?

Al-Allo · 2013-06-21 09:20:39

YEs, I've included the m's in the equation above. ALso, I got 0,392 for two persons hitting !

bobbym · 2013-06-21 09:22:41

Very good! These problems can be tricky. I got the wrong answer too. You have to be careful. Now you can figure out 0,1,2,3 easily.]

See you later, I have to go.

Al-Allo · 2013-06-21 09:23:48

Ok, bye and thank you again. If it happens again, I'll remember to do a drawing like yours !

bobbym · 2013-06-21 18:33:33

Hi;

You are a fast learner.

Angie Pop · 2013-07-14 21:31:21

I have just had a bit of look at these particular posts regarding "A little question on Probability". I was on the understanding that this forum was for Maths is Fun for Kids from Kindergarten to Year 12, just looking at these particular posts I don't se how this forum would assist me if I was to ask about "Probability - Chance and Data" - for Kids

Thank you

bobbym · 2013-07-14 22:46:29

Hi Angie Pop;

Welcome to the forum.

I don't se how this forum would assist me if I was to ask about "Probability - Chance and Data" - for Kids

Hmmm, might be worth a shot to post your question and see what the tooth fairy brings.

Angie Pop · 2013-07-14 23:45:29

That is a fair response, quite amazed at what I looked at in previous posts, is all, the course that I am doing is for Kids in Early Primary to Mid School and Upper Primary, just looking at the Maths is Fun website, seems more simplistic

bobbym · 2013-07-15 00:01:26

Hi;

The MIF site has tons of stuff on probability.

http://www.mathsisfun.com/data/probability.html

http://www.mathsisfun.com/probability_line.html

When the kids have a question about any of it, that is when it is time to come in here.

Then they can learn from Yoda, the Jedi master who instructed me.

I never thought I would get a chance to use that quote from "The Empire Strikes Back!"

Math Is Fun Forum

#26 2013-06-21 08:45:58

Re: Little question (Probability)

#27 2013-06-21 08:49:55

Re: Little question (Probability)

#28 2013-06-21 09:01:54

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#29 2013-06-21 09:05:24

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#30 2013-06-21 09:15:31

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#31 2013-06-21 09:19:01

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#32 2013-06-21 09:20:39

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#33 2013-06-21 09:22:41

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#34 2013-06-21 09:23:48

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#35 2013-06-21 18:33:33

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#36 2013-07-14 21:31:21

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#37 2013-07-14 22:46:29

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#38 2013-07-14 23:45:29

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#39 2013-07-15 00:01:26

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