Suppose a groupe of 3 boys and 7 girls are playing together. The teacher needs to select 2 students. The first student can be a boy or girl, but the second student must be a girl. What is the probability that the second person picked is a girl?
Suppose a groupe of 3 boys and 7 girls are playing together. The teacher needs to select 2 students. The first student can be a boy or girl, but the second student must be a girl. What is the probability that the second person picked is a girl?
Last edited by bowsth; 10-21-2010 at 03:53 AM.
Damn i Remeber doing this
it was something like 10C7 on the stats calculator, If I had my calculator I would check it out
Or something like that
Originally posted by beemerm3
so if we only seen 5 % of the oceans why not drain them or somethin lol or can u even transfer water from one ocean to another??? think of all the stuff u'd find treasures n eerything.
Since the second student must be a girl, the probability of a girl being picked second is 100%Originally posted by bowsth
Suppose a groupe of 3 boys and 7 girls are playing together.
The teacher needs to select 2 students.
The first student can be a boy or girl,
the second student must be a girl.
What is the probability that the second person picked is a girl?
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Haha, totally one of those greasy LSAT, GMAT, MCAT type questions.Originally posted by gretz
Since the second student must be a girl, the probability of a girl being picked second is 100%
there are two possible ways to a choose a Girl (G) or second:
a)1st choose boy , then choose girl
b)1st choose girl, then choose girl
for case a: BG = 3/10 * 7/9 = 21/90
b: GG = 7/10 * 6/9 = 42/90
a+b = 7/10 <---- that is the probability
i think that is right.
Last edited by jazzyb; 10-21-2010 at 02:00 PM.
replyOriginally posted by theken
Off duty cop means not a cop. At that time he is a normal person.
Originally posted by ZorroAMG
Yes. Just like a ninja in street clothes isn't a ninja.
Are you high? lolOriginally posted by jazzyb
there are to possible ways to a choose a Girl (G) or second:
a)1st choose boy , then choose girl
b)1st choose girl, then choose girl
for case a: BG = 3/10 * 7/9 = 21/90
b: GG = 7/10 * 6/9 = 42/90
a+b = 7/10 <---- that is the probability
i think that is right.
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no, want to show your math? its not possible to have 100%.Originally posted by gretz
Are you high? lol
replyOriginally posted by theken
Off duty cop means not a cop. At that time he is a normal person.
Originally posted by ZorroAMG
Yes. Just like a ninja in street clothes isn't a ninja.
10C1 x 7C1 but there is a restriction, if the one person picked is a girl... then there is something you need to do. Can't remember right now.. anyone else complete it?Originally posted by bowsth
Suppose a groupe of 3 boys and 7 girls are playing together. The teacher needs to select 2 students. The first student can be a boy or girl, but the second student must be a girl. What is the probability that the second person picked is a girl?
Look about 3 posts above you, i'm pretty sure i got it.Originally posted by TYMSMNY
10C1 x 7C1 but there is a restriction, if the one person picked is a girl... then there is something you need to do. Can't remember right now.. anyone else complete it?
replyOriginally posted by theken
Off duty cop means not a cop. At that time he is a normal person.
Originally posted by ZorroAMG
Yes. Just like a ninja in street clothes isn't a ninja.
lol... it was a joke howdy...Originally posted by jazzyb
no, want to show your math? its not possible to have 100%.
Here is my math...
Student picked 2nd is a girl= true, therefore girlpicked2nd = 1
If girlpicked2nd = 1, then probability = $(100%)
else, probability = n
endif
Enter
girlpicked2nd = 1 Enter
100%
Its been a while lol...
Last edited by gretz; 10-21-2010 at 02:14 PM.
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^^in addition, percents are not probabilities.
It can be represented as a percentage though.Originally posted by Guillermo
^^in addition, percents are not probabilities.
LOL, right you are. I didn't have a calc in front of me to verify.Originally posted by jazzyb
Look about 3 posts above you, i'm pretty sure i got it.
But then it's not a probability, it's a percent.Originally posted by Disoblige
It can be represented as a percentage though.
pretty sure a probability can be represented as a percent..Originally posted by Guillermo
But then it's not a probability, it's a percent.
From what I recall, probabilities can be shown in fractions, ratios, percentages or decimals.
1/3, 1:3, 33.33% or 0.333 are all the same thing.
....
There's a 67% chance that it's not a probability if expressed in a percentage.Originally posted by Guillermo
But then it's not a probability, it's a percent.
anymore questions of the sort, good practice, i'm writing the gmat in 2-3months.
replyOriginally posted by theken
Off duty cop means not a cop. At that time he is a normal person.
Originally posted by ZorroAMG
Yes. Just like a ninja in street clothes isn't a ninja.
Should keep it to minimum two decimal places.Originally posted by Hakkola
....
There's a 67% chance that it's not a probability if expressed in a percentage.