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In a certain bookcase, 10 books are about science, 8 are about literat
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18 Jan 2019, 01:03
18 Jan 2019, 01:03
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A
B
C
D
E
Difficulty:
5%
(low)
Question Stats:
85% (00:59) correct
15%
(01:20)
wrong
based on 79
sessions
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
A 0.08
B 0.2
C 0.3
D 0.4
E 0.6
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Re: In a certain bookcase, 10 books are about science, 8 are about literat
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18 Jan 2019, 06:09
18 Jan 2019, 06:09
Expert Reply
Bunuel
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
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
Answer: Option E
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Re: In a certain bookcase, 10 books are about science, 8 are about literat
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18 Jan 2019, 07:39
18 Jan 2019, 07:39
Bunuel
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
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
