2005 June 12th, 04:01 PM
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#21 (permalink) |
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Within my grasp!
 Join Date: Jun 2005
Posts: 388
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Re: one probability question
Hi Brinda!
I get a different answer for your question. On any day in April in a certain city, the probability of rain is 50%. What is the probability of that it rains exactly 5 days during a 7 day period in April? Acc to my calculation, Probability that it will rain in a any day is 1/2 Prabability that it will not rain is (1-1/2) = 1/2 Probability that it will rain exactly 5 days and will not rain the other two days = 1/2 *1/2*1/2*1/2*1/2*1/2*1/2 = 1/128 Please let me know the correct answer. Thanks.
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Dinesh |
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2005 June 12th, 04:41 PM
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#22 (permalink) | |
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TestMagic Guru
Join Date: Nov 2004
Location: INDIA
Posts: 1,810
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Re: one probability question
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"Fear less,hope more; whine less,breathe more; Talk less,work more; hate less,love more; Then all the good things are yours ." ---Proverb--- |
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2005 June 12th, 05:35 PM
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#23 (permalink) | |
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Dumbledore's Army
Join Date: Jan 2005
Posts: 2,334
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Re: one probability question
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nCr(p)^r(q)^n-r so here its 7C2(50/100)5(50/100)2 which is 21(1/2)^7
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If you can't change your mind, are you sure you have one? Be weird whenever you have the chance Don't lurk! Please participate  OF COURSE I DON'T LOOK BUSY...I DID IT RIGHT THE FIRST TIME. |
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2005 June 12th, 06:22 PM
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#24 (permalink) |
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TestMagic Guru
Join Date: Nov 2004
Location: INDIA
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Re: one probability question
ish, why cant we use the other approach?
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"Fear less,hope more; whine less,breathe more; Talk less,work more; hate less,love more; Then all the good things are yours ." ---Proverb--- |
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2005 June 12th, 06:25 PM
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#25 (permalink) |
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Dumbledore's Army
Join Date: Jan 2005
Posts: 2,334
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Re: one probability question
because you have to account for the number of ways you can choose 5 out of 7, and then compute their respective probabilities. its also a question of choice, isnt it?
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If you can't change your mind, are you sure you have one? Be weird whenever you have the chance Don't lurk! Please participate OF COURSE I DON'T LOOK BUSY...I DID IT RIGHT THE FIRST TIME. |
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2005 June 12th, 06:28 PM
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#26 (permalink) |
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TestMagic Guru
Join Date: Nov 2004
Location: INDIA
Posts: 1,810
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Re: one probability question
yes I know that.. was actually wondering about the other approach..anyway, the solution is clear now.
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"Fear less,hope more; whine less,breathe more; Talk less,work more; hate less,love more; Then all the good things are yours ." ---Proverb--- |
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2005 June 17th, 06:53 AM
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#28 (permalink) | |
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Within my grasp!
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Join Date: Mar 2005
Posts: 130
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thanks dinesh for thy encouragement. i will try to post as many problems as i can
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