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In a 12-hour period of time, a drawbridge opens 8 times, holding traffic for 15 minutes each time. If a car approaches the bridge during this 12-hour time, find the probability that the bridge is open.

 Mar 16, 2021
 #1
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The bridge is open with probability 2/15.

 Mar 16, 2021
 #2
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In a 12-hour period of time, a drawbridge opens 8 times, holding traffic for 15 minutes each time. If a car approaches the bridge during this 12-hour time, find the probability that the bridge is open.    

 

open 8 times for 15 minutes each time

makes a total of open for 120 minutes, which is 2 hours  

 

                                                                    2  

in the 12 hour period, the bridge is open  —–—  of the time 

                                                                   12   

 

                                                                                                    2  

i think this means the probability of finding the bridge open is  —–—  

                                                                                                   12   

            1  

this is  —–   or in decimal form, 16.67   

            6  

 Mar 16, 2021

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