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

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Manager
Joined: 21 Jun 2019
Posts: 96
Concentration: Finance, Accounting
GMAT 1: 670 Q48 V34
GPA: 3.78
There was a trial going on in a laboratory. Students were doing an  [#permalink]

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Updated on: 16 Jul 2019, 13:57
1
00:00

Difficulty:

15% (low)

Question Stats:

95% (00:56) correct 5% (01:01) wrong based on 20 sessions

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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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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.
Manager
Joined: 23 Apr 2018
Posts: 119
Re: There was a trial going on in a laboratory. Students were doing an  [#permalink]

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16 Jul 2019, 13:23
Is it a DS question?

Posted from my mobile device
Manager
Joined: 21 Jun 2019
Posts: 96
Concentration: Finance, Accounting
GMAT 1: 670 Q48 V34
GPA: 3.78
Re: There was a trial going on in a laboratory. Students were doing an  [#permalink]

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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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Manager
Joined: 26 Mar 2019
Posts: 100
Concentration: Finance, Strategy
Re: There was a trial going on in a laboratory. Students were doing an  [#permalink]

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16 Jul 2019, 14:34
1
Quote:
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

Re: There was a trial going on in a laboratory. Students were doing an   [#permalink] 16 Jul 2019, 14:34
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