CUET · MATHS · PYQ PAPER 2023
The variance of number of heads in three tosses of a coin is:
- A \(3 / 2\)
- B \(3 / 4\)
- C 1
- D 2
Answer & Solution
Correct Answer
(B) \(3 / 4\)
Step-by-step Solution
Detailed explanation
\( n = 3, p = 0.5 \) \( Var(X) = np(1-p) = 3 \times 0.5 \times (1 - 0.5) = 3 \times 0.5 \times 0.5 = 0.75 \) \( 0.75 = 3/4 \)
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