Chapter 7.3, Problem 52E

DISTRACTED DRIVING According to a study of $100$ drivers in metropolitan Washington, D.C., whose cars were equipped with cameras with sensors, the distractions, and the number of incidents (crashes, near crashes, and situations that require an evasive maneuver after the driver was distracted) caused by these distractions are as follows:

Distraction	$A$	$B$	$C$	$D$	$E$	$F$	$G$	$H$	$I$
Driving Incidents	$668$	$378$	$194$	$163$	$133$	$134$	$111$	$111$	$89$

where $A=$ Wireless device (cell phone, PDA)

$B=$ Passenger

$C=$ Something inside car

$D=$ Vehicle

$E=$ Personal hygiene

$F=$ Eating

$G=$ Something outside car

$H=$ Talking/singing

$I=$ Other

If an incident caused by a distraction is picked at random, what is the probability that it was caused by:

a. The use of a wireless device?

b. Something other than personal hygiene or eating?

Source: Virginia Tech Transportation Institute and NHTSA.