CUET · MATHS · PYQ PAPER 2023
Let \(X\) denotes the number of hours you study during a randomly selected school day. The random variable \(X\) has the following probability distribution.
| X | 0 | 1 | 2 | 3 | 4 |
| P(X) | K | 2K | 2K | 2K | K |
| LIST - I | LIST - II |
| (A) Value of K | (I) \(\frac{1}{4}\) |
| (B) Probability you study at least two hours | (II) \(\frac{1}{8}\) |
| (C) Probability you study exactly two hours | (III) \(\frac{3}{8}\) |
| (D) Probability you study at most one hour | (IV) \(\frac{5}{8}\) |
- A (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
- B (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
- C (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
- D (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
Answer & Solution
Correct Answer
(A) (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
Step-by-step Solution
Detailed explanation
(A) \( \sum P(X) = 1 \) \( K + 2K + 2K + 2K + K = 1 \) \( 8K = 1 \Rightarrow K = \frac{1}{8} \) (B) \( P(X \ge 2) = P(X=2) + P(X=3) + P(X=4) \) \( P(X \ge 2) = 2K + 2K + K = 5K = 5 \times \frac{1}{8} = \frac{5}{8} \) (C) \( P(X=2) = 2K \)…
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