Question

A random variable X, takes the values 0,1,2, and 3. Mean of X is P(x = 3) = 2P(x = 1) and P(x = 2) = 0.3, then P(X=0) is : 

(i) 0.2 

(ii) 0.4 

(iii) 0.3 

(iv) 0.1

Answer 1

Answer is (ii)