Which of these statements is true about continuous random variables and their probability distributions? The distribution is modeled by a probability distribution that is non-negative. The probability...

Which of these statements is true about continuous random variables and their probability distributions?

1. The distribution is modeled by a probability distribution that is non-negative.


2. The probability of an individual event E is calculated by P(X=E).


3. The total area under the curve is 1.
   
   
   
   

   
   
   • II only
   
   
   • I and III only
   
   
   • III only
   
   
   • I and II only
   
   
   • I only