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There was a trial going on in a laboratory. Students were doing an

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GeorgeKo111
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There was a trial going on in a laboratory. Students were doing an [#permalink] New post   Updated on: 16 Jul 2019, 13:57
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There was a trial going on in a laboratory. Students were doing an experiment. This experiment showed that the probability of a bird flies away when the cage is opened is 7/10. It was also observed that the bird that flew away also comes back is 1/5.what is the probability that when the cage is opened a bird not only flies away but also comes back.
a. 7/10
b. 3/10
c. 1/5
d. 7/50
e. None of the above
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D

Originally posted by GeorgeKo111 on 16 Jul 2019, 11:51.
Last edited by GeorgeKo111 on 16 Jul 2019, 13:57, edited 1 time in total.
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RusskiyLev
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Re: There was a trial going on in a laboratory. Students were doing an [#permalink] New post   16 Jul 2019, 14:34
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There was a trial going on in a laboratory. Students were doing an experiment. This experiment showed that the probability of a bird flies away when the cage is opened is 7/10. It was also observed that the bird that flew away also comes back is 1/5.what is the probability that when the cage is opened a bird not only flies away but also comes back.


In order for two probabilities to happen, we need to multiply them by each other: P1 * P2 = P
7/10 * 1/5 = 7/50

Answer: D
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Re: There was a trial going on in a laboratory. Students were doing an [#permalink] New post   16 Jul 2019, 13:23
Is it a DS question?

Posted from my mobile device
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GeorgeKo111
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Re: There was a trial going on in a laboratory. Students were doing an [#permalink] New post   16 Jul 2019, 13:58
Shrey9 wrote:
Is it a DS question?

Posted from my mobile device


no it is a PS.
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Re: There was a trial going on in a laboratory. Students were doing an [#permalink]
16 Jul 2019, 13:58
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