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If Var(x)=0.4327, and E(x^2) = 0.75. Find E(x).

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If Var(x)=0.4327, and E(x2) = 0.75. Find E(x).

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Var(x) = E(x2) – [E(x)]2

0.4327 = 0.75 – [E(x)]2

[E(x)]2 =0.75-0.4327 

= 0.3153

∴ E(x) = √(0.3153)

 = 0.5615.

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