question in risk management knowledge area

The question is: Management has just assigned you to an important new project and you need to figure out the path convergence in the figure shown, if the odds of completing activities 1, 2 and 3 on time are 50%, 30% and 40%. What are the chances of starting activity 4 on day 6??
Regards
Vijaya
 
 

It should be like this :=0.50*0.40*0.30 = 0.06


     

50%

     
     

ACTIVITY
1/ 5DAYS

     
   

> 


 

   
   

 

 

 

   
   

 


30%

 

 

6%

START


 


 


ACTIVITY
2/ 5DAYS


 


 


ACTIVITY 4


> 

> 

 


> 

   

 

 

 

   
   

 


40%

 

   
   

 

ACTIVITY
3/ 5DAYS


 

   
   

> 

     

Thank You Sir