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Let X be any random variable, and E( X ) = 2, then, the probability that...

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.
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Answer #1

from Markov Inequality : P(X>a) <E(x)/a

therefore P(X>10) <=2/10

P(X>10) <0.2

option C is correct

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