47. Books in the library are found to be normally distributed and have an average length of 350 pages with a standard deviation of 100 pages. What percentage of library books have a length of 80 pages? 48. The lifespans of gorillas in a particular zoo are normally distributed. The average gorilla lives 16 years; the standard deviation is 1.4 years. Use the empirical rule to estimate the percentage of gorillas living between 14.6 and 18.8 years. Show your work by drawing the normal distribution.

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47. Books in the library are found to be normally distributed and have an average length of 350 pages with a
standard deviation of 100 pages. What percentage of library books have a length of 80 pages?
48. The lifespans of gorillas in a particular zoo are normally distributed. The average gorilla lives 16 years; the
standard deviation is 1.4 years. Use the empirical rule to estimate the percentage of gorillas living between 14.6 and
18.8 years. Show your work by drawing the normal distribution.
shev
49. The mean growth of the thickness of trees in a forest is found to be 0.5 cm/year with a standard deviation
of 0.1 cm/year. If there are 350 trees in a forest, then what percent of the trees have a growth between 0.6 to
0.78 cm/year? Approximately how many trees have a growth between 0.6 to 0.78 cm/year?
tew. (e)
50) We did a test and found that we were 95% confident that the population mean was between
[4.5, 14.5]. What is the sample mean?
hell
e si ol pi
ne er eow JeW
mot ed olao0
veb bisbne
ol eonun 2
11
Transcribed Image Text:47. Books in the library are found to be normally distributed and have an average length of 350 pages with a standard deviation of 100 pages. What percentage of library books have a length of 80 pages? 48. The lifespans of gorillas in a particular zoo are normally distributed. The average gorilla lives 16 years; the standard deviation is 1.4 years. Use the empirical rule to estimate the percentage of gorillas living between 14.6 and 18.8 years. Show your work by drawing the normal distribution. shev 49. The mean growth of the thickness of trees in a forest is found to be 0.5 cm/year with a standard deviation of 0.1 cm/year. If there are 350 trees in a forest, then what percent of the trees have a growth between 0.6 to 0.78 cm/year? Approximately how many trees have a growth between 0.6 to 0.78 cm/year? tew. (e) 50) We did a test and found that we were 95% confident that the population mean was between [4.5, 14.5]. What is the sample mean? hell e si ol pi ne er eow JeW mot ed olao0 veb bisbne ol eonun 2 11
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