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In a certain bookcase, 10 books are about science, 8 are about literat

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Joined: 02 Sep 2009
Posts: 53063

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18 Jan 2019, 00:03
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Difficulty:

15% (low)

Question Stats:

91% (00:51) correct 9% (02:54) wrong based on 24 sessions

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In a certain bookcase, 10 books are about science, 8 are about literature, 5 are about history, and 2 are about psychology. If a book is selected at random, what is the probability that the book is about science or history?

A 0.08
B 0.2
C 0.3
D 0.4
E 0.6

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18 Jan 2019, 05:09
Bunuel wrote:
In a certain bookcase, 10 books are about science, 8 are about literature, 5 are about history, and 2 are about psychology. If a book is selected at random, what is the probability that the book is about science or history?

A 0.08
B 0.2
C 0.3
D 0.4
E 0.6

Probability of Science of History = (Science books+History Books) / Total Books

i.e. Required Probability = (10+5) / (10+8+5+2) = 15/25 = 3/5 = 0.6

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18 Jan 2019, 06:39
Bunuel wrote:
In a certain bookcase, 10 books are about science, 8 are about literature, 5 are about history, and 2 are about psychology. If a book is selected at random, what is the probability that the book is about science or history?

A 0.08
B 0.2
C 0.3
D 0.4
E 0.6

total books = 25
science 10; history = 5

probability that the book is about science or history
so
10/25 + 5/25 = 15/25 = 3/5 = 0.6
IMO E
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Re: In a certain bookcase, 10 books are about science, 8 are about literat   [#permalink] 18 Jan 2019, 06:39
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