Question

QUESTION 15

1. Let X be a nonnegative random variable (the possible values of X are all nonnegative numbers), and suppose  E( X ) = 1, then, the probability that X takes a value greater than 5, cannot be

   	A.	larger than 0.1.
   	B.	larger than 0.2.
   	C.	less than 0.2.
   	D.	none of the above.

QUESTION 16

1. Let X be any random variable, and E( X ) = 2, then, the probability that X takes a value greater than 10, cannot be

   	A.	0.05.
   	B.	0.1.
   	C.	0.2.
   	D.	none of the above.

QUESTION 17

1. Let X1 and X2 be any two random variables, then E( Cov( X1, X2) ) =

   	A.	X1 times X2, i.e., X1*X2.
   	B.	X1 / X2.
   	C.	Cov( X1, X2).
   	D.	none of the above.

Answer 1