1.

If X is a random variable and E(X) =1.5, then what is the value of E(3 + 4X)?

Answer»

E(3 + 4X) 

= E(4x + 3) 

= 4.E(x) + 3 

= 4.(1.5) + 3 

= 6 +3 = 9 

since E(ax+b) 

= aE(x)+b.



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