Question 1165872
.
The city finds empirically that the probability that an automobile going through the intersection 
of 5th and Main will run a red light sometime during a given day is 8.9%, 
and the probability that an automobile going through the intersection of 7th and Polk 
will run a red light sometime during a given day is 11.7%. 
Suppose a car is picked at random at 5th and Main on a given day and another at random at 7th and Polk. 
Write each probability as a percentage rounded to one decimal place.
What is the probability that neither car runs a red light?
~~~~~~~~~~~~~~~~~~~~~


<pre>
    P = (1-0.089)*(1-0.117) = 0.804413.    <U>ANSWER</U>
</pre>

Solved.


The formula is SELF-EXPLANATORY.


If the meaning of the formula is unclear to you at first sight, 
then look in it and hear attentively: it will tell you everything and will explain itself.