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If E(X) = 10 and SD (X) = 12, then find E(X2 ). |
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Answer» We know that ; S.D.(X) = √var(x) Squaring both the sides, [S.D (X)]2 = E(X2 ) – [E(X)]2 By substituting ; 122 = E (X2 ) – (10)2 ∴ E(X2 )= 144 – 100 = 44. |
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