5. High school textbooks don't last forever. The lifespan of all high school textbooks is approximately normal with a mean of 9 years and a standard deviation of 2.5 years. (a) What percentage of books last longer than 10 years? (b) What percentage of books last less than 5 years? (c) How old is a textbook if it lasts as no longer than 30% of all other books?
5. High school textbooks don't last forever. The lifespan of all high school textbooks is approximately normal with a mean of 9 years and a standard deviation of 2.5 years. (a) What percentage of books last longer than 10 years? (b) What percentage of books last less than 5 years? (c) How old is a textbook if it lasts as no longer than 30% of all other books?
MATLAB: An Introduction with Applications
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Author:Amos Gilat
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![5. High school textbooks don't last forever.
The lifespan of all high school textbooks is
approximately normal with a mean of 9 years
and a standard deviation of 2.5 years.
(a) What percentage of books last longer
than 10 years?
(b) What percentage of books last less than 5
years?
(c) How old is a textbook if it lasts as no
longer than 30% of all other books?
(d) What percentage of books last between 7
years and 12 years?
(e) If you were told that a particular book
lasted 15 years, would you be surprised?
Why? Give statistical justification for your
answer.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd892e9e8-71c0-4846-af7f-3d1190bdee9b%2Fb2dd866d-8422-4069-aad4-41e5b9e648d2%2F48kdl2i_processed.jpeg&w=3840&q=75)
Transcribed Image Text:5. High school textbooks don't last forever.
The lifespan of all high school textbooks is
approximately normal with a mean of 9 years
and a standard deviation of 2.5 years.
(a) What percentage of books last longer
than 10 years?
(b) What percentage of books last less than 5
years?
(c) How old is a textbook if it lasts as no
longer than 30% of all other books?
(d) What percentage of books last between 7
years and 12 years?
(e) If you were told that a particular book
lasted 15 years, would you be surprised?
Why? Give statistical justification for your
answer.
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