Chapter 4.2, Problem 12P

Auto Accidents: Age Let x be the age of a licensed driver in years. Let y be the percentage of all fatal accidents (for a given age) due to failure to yield the right-of-way. For example, the first data pair states that 5% of all fatal accidents of 37-year-olds are due to failure to yield the right-of-way. The Wall Street Journal article referenced in Problem 11 reported the following data:

x	37	47	57	67	77	87
y	5	8	10	16	30	43

Complete parts (a) through (e), given ${\displaystyle \sum x}=372,{\displaystyle \sum y=112,{\displaystyle \sum x^2=24,814,{\displaystyle \sum y^2=3194,{\displaystyle \sum xy=8254,\text{and}r\approx -\mathrm{0.943.}}}}}$

(f) Predict the percentage of all fatal accidents due to failing to yield the right-of-way for 70-year-olds.