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A computer randomly picks a two digit number greater than 49. Find the odds that the number picked is a multiple of 5.
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I really have no idea... HELP!!!!
RaphaelFilgueiras
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the odd is probability?
swissgirl
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How many 2 digit numbers are there?
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I don't know
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odds does not mean odd in this question
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odds mean by probability
swissgirl
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well lets count
10-99
swissgirl
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Ok there are 90 2 digit numbers
RaphaelFilgueiras
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|dw:1372307123036:dw|
swissgirl
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And that number has to be great than 49
swissgirl
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S there are 50 possible choices altogether
RaphaelFilgueiras
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|dw:1372307186299:dw|
RaphaelFilgueiras
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now the probability is n/n1
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my answer book says 1:4 but I dont understand
swissgirl
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hmmm I got a 1/5
RaphaelFilgueiras
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@HELP!!!! get it?
swissgirl
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How did you get n_1=40?
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im kind of confused with the n1 and n
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uhhhh
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my book says 1:4 can anyone explain how or why?
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can you guys guess how that happened?
RaphaelFilgueiras
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i htink the rigth ans is 1/5if odd means probability
zzr0ck3r
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hmm I would have guessed 1/5, but it must have something to do with starting on 50
swissgirl
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But it can be 50 since the number is greater than 49
zzr0ck3r
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right, I still don't see how that makes it 1 to 4
swissgirl
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umm are u sure the answer is 1:4?
RaphaelFilgueiras
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i think the book is wrong
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well my work book is ment to trick people somehow
zzr0ck3r
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oh 1/5 is 1:4
swissgirl
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How so?
zzr0ck3r
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favorable outcome : unfavorable outcume
zzr0ck3r
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I think, maybe not....
zzr0ck3r
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1 to 4 ratio means put in 1 for every 4 so you have put in 1/5
RaphaelFilgueiras
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make some sense
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IM LOST
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but I get it at the same time
swissgirl
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hahahaah oh yaaaaaaaaa?
RaphaelFilgueiras
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four cons and 1 odd
swissgirl
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Ohhhh I seee now I get it
zzr0ck3r
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imagine a 1:4 ratio of some liquid and water
for every 4 gallons of water you put in one gallon of some liquid
if you do this once, you have put in 1/5 of the whole
swissgirl
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Yup I see that
RaphaelFilgueiras
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weird way to put the answer
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I SI
swissgirl
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Ok so basically the probability that you will get a multiple of 5 is a 1/5 meaning that for every 5 picks one out of the 5 picks will be a multiple of 5. In other words 1 pick will be a multiple of 5 while the other 4 will not.
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kirbykirby
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lol i had a huge discussion about odds and ratios yesterday
swissgirl
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Its weird that the answer is in a ratio. I dont see the point of that.
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wow ...
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Well thanks guys 4 the HELP!!!!
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its seems like everyone wants to talk about it alittle bit more