1 Select the correct answer.
The numbers of pages in the books in a library follow a normal distribution. If the mean number of pages is 180 and the standard deviation is 30
pages, what can you conclude?

• A
B
About 60% of the books have fewer than 150 pages.

About 16% of the books have fewer than 150 pages.

About 95% of the books have more than 150 pages.
C.
D.
About 16% of the books have more than 150 pages.
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