Normals: n1=(1,1,−1), n2=(3,2,1). cosθ=∣n1∣∣n2∣n1⋅n2=3143+2−1=424=21242. So θ=cos−121242.
Which of the following statements are correct ? (A) var(aX + b) = a^2 var(X) (B) var(X) = E(X^2) - E(X)^2 (C) E(aX + b) = aE(X) + b (D) E(X) =…
CUET UG 2023 — Mathematics Applied-Mathematics
2023mcqeasy
Which of the following statements are correct ?
(A) var(aX+b)=a2var(X)
(B) var(X)=E(X2)−{E(X)}2
(C) E(aX+b)=aE(X)+b
(D) E(X)=i=1∑npixi2
Choose the correct answer from the options given below :
Official previous-year question
Held on 30 May 2023 · Verified 13 Jul 2026.
Options
- A
(A), (C) Only
- B
(A), (B) Only
- C
(A), (B), (C) Only
- D
(A), (C), (D) Only
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