Answer to Question #303898 in Statistics and Probability for Ian

Question

Suppose three cell phones are tested at random where D represent the defective cell phone and N represent the non-defective cell phone. Let X represents the number of defective cell phones that occur. , show the values of the random variable X . 

Answer 1

Since three phones are tested and any of them can be defected, then there can be from 0 to 3 defected cell phones. So, X={0,1,2,3}