Section 7D

Section 7D

Assessing Risk

car crash fatalities = 40,200

•  $\frac{40,200\ deaths}{1\ year}\times\frac{1\ year}{365\ days}\times\frac{1\ day}{24\ hours}\times\frac{1\ hour}{60\ mi\eta utes}$  

•  $\frac{40,200\ deaths}{525,600\ mi\eta}=\frac{67}{876}\approx\frac{1\ death}{13.0746\ \min}$  

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1995: 41,817 deaths per 2.4 trillion miles

•  $\frac{41,817\ death}{2,400,000,000,000\ miles}=\frac{?\ deaths}{100,000,000\ miles}$  

•  $\frac{1.742375\times10^{-8}\ deaths}{1\ mile}\times\frac{100,000,000}{100,000,000}=\frac{1.74\ deaths}{100,000,000\ miles}$  

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Open Ended

13.

d. Are the changes in the three fatality rates from 1995 to 2015 that you found in parts (a)–(c) consistent with one another? Briefly comment on the general conclusions they suggest.

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31. a. Make a table showing the percentage of Americans over age 65 between 1950 and 2015.

•  $\frac{12.7\ seniors}{151\ total\ pop}\approx0.084105\ or\ 8.4\%$  

•  $\frac{17.2}{179}\approx0.096089\ or\ 9.6\%$  

•  $\frac{20.9}{203}\approx0.1029556\ or\ 10.3\%$