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Each of the 350 students either is graduate or postgraduate.

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Each of the 350 students either is graduate or postgraduate.  [#permalink]

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New post 13 Aug 2018, 10:22
1
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

73% (01:21) correct 27% (00:53) wrong based on 62 sessions

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Each of the 350 students either is graduate or postgraduate. What is the probability that one student selected at random is a female postgraduate?

(1) The number of postgraduates is 187

(2) The number of the female students is 247

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Re: Each of the 350 students either is graduate or postgraduate.  [#permalink]

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New post 13 Aug 2018, 13:11
We have four variables male,female,graduate,postgrad

Info We have only postgrad 187
Grad 350-187
Female 247
Male 350-247

But we don’t know how many females are postgrad hence

Its E

HOPE its correct


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Re: Each of the 350 students either is graduate or postgraduate.  [#permalink]

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New post 15 Aug 2018, 18:07
Why wouldn't this be C?

(187/350) * (247/350)

Does that only work for separate events?
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Re: Each of the 350 students either is graduate or postgraduate.  [#permalink]

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New post 15 Aug 2018, 20:00
I think it should be C.

The condition would be that the randomly selected student should be female and also a postgraduate, so this can be calculated as:

P( Female)= (247/350)
P (postgraduate) = (187/350)

P(female postgraduate)= (247/350)*(187/350)





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Re: Each of the 350 students either is graduate or postgraduate.  [#permalink]

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New post 24 Aug 2018, 16:35
Whats the official answer for this ??


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Re: Each of the 350 students either is graduate or postgraduate. &nbs [#permalink] 24 Aug 2018, 16:35
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