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X is a non-negative random variable with E(X2)=12.1. In addition, it is known that Pr(X=2)=0.4 and Pr(X=5)=0.1. X can take on only one other value

X is a non-negative random variable with E(X2)=12.1. In addition, it is known that Pr(X=2)=0.4 and Pr(X=5)=0.1. X can take on only one other value besides 2 and 5.

What is the other value that X can take?

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