jerilynsocool7335 jerilynsocool7335

15-03-2018
Mathematics

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For random variable x, it is known that e[x] = 2 and v ar(x) = 3. find e[x2

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LammettHash LammettHash

15-03-2018

[tex]\mathbb V(X)=\mathbb E(X^2)-\mathbb E(X)^2[/tex]
[tex]\implies3=\mathbb E(X^2)-2^2[/tex]
[tex]\implies\mathbb E(X^2)=7[/tex]

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