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Data/probability problem

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asdfdsa
Posts: 1268 - Karma: 13
 Number of visits | Number of customers
1                                4
2                                6
3                                7
4 or more                  3


 ok so


 based on the survey, what are the odds that a customer visited the store 3 times

Mar 8 2010 8:45PM
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Tinga
Posts: 11349 - Karma: 2,333
50%
Mar 8 2010 8:46PM
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the_goose69
Posts: 595 - Karma: 35
7:13 or 7 out of 20
Mar 8 2010 8:47PM
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asdfdsa
Posts: 1268 - Karma: 13
yeah, its 7/13, but how?
Mar 8 2010 8:47PM
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the_goose69
Posts: 595 - Karma: 35
cus out of the the 20 total 7 of them went three times leaving 13 left i dont really know why its been a while since i did this but yea thats the answer
Mar 8 2010 8:50PM
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1080ski
Posts: 4424 - Karma: 191
It depends. Is the question asking about how many people went to the store 3 times and ONLY 3 times? In this case, the answer would be 7/20. Or is the question asking how many people went to the store 3 times (which would also include those who went to the store 4 times, since at one point, they went to the store 3 times)? In this case, the answer is (7+3)/20 = 10/20 = 1/2 = .5.
Mar 8 2010 8:58PM
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asdfdsa
Posts: 1268 - Karma: 13
it asks how many people went exactly 3 times and the answer in the back is 7/13.


Mar 8 2010 9:05PM
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Jordan
Posts: 4079 - Karma: 2,122
use PDF then, not CDF



Mar 8 2010 9:07PM
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Tinga
Posts: 11349 - Karma: 2,333
oh, right. exactly is a key word.
Mar 8 2010 9:08PM
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babujib
Posts: 5039 - Karma: 104
lol stat joke
Mar 8 2010 9:08PM
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