C  a rectangle. brainily says this is too short so I am writing more 
        
             
        
        
        
There are 300 seconds in 5 minutes
        
                    
             
        
        
        
If 25% of the people <em>are</em> vaccinated, then 75% of the people are <em>not</em> vaccinated.  Of those not vaccinated, each has a 50% chance of contracting the disease.  The probability that someone is both not vaccinated and contracts the disease is (0.75)(0.5)=0.375.
The probability that someone is vaccinated and contracts the disease is (0.25)(0.1)=0.025 (it is multiplied by 0.1 because if the vaccine is 90% effective, then there is a 10% chance someone that is vaccinated can contract the disease.
Add these together for the total:  0.375+0.025=0.4
There is a 40% chance that someone chosen at random will contract the disease.
        
             
        
        
        
the answer is 304 
Step-by-step explanation:
write the formula and Substitute the Numbers. 
I hope This Helps! 
 
        
             
        
        
        
Answer:
1/12
Step-by-step explanation:
Is the answer I'm bro