Question

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?
А.About 60% of the books have fewer than 150 pages.
BAbout 16% of the books have fewer than 150 pages.
C. About 95% of the books have more than 150 pages.
DAbout 16% of the books have more than 150 pages

Answer 1

Find percentage

• Mean/SD×100
• 30/180×100
• 1/6×100
• 100/6
• 16.2%

Option D

Answer 2

Solution given;

mean=180

standard deviation=30

now

percentage =standard deviation/mean ×100%

=30/180×100%

=16%

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