✓ 4 MARKS
Case Study
🔥 APPEARED IN 3 BOARD SETS
A biased die is tossed and respective probabilities for various faces to turn up are the following :
| Face | 1 | 2 | 3 | 4 | 5 | 6 |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| Probability | 0.1 | 0.24 | 0.19 | 0.18 | 0.15 | K |
Based on the above information, answer the following questions :
(a) What is the value of K ?
(b) If a face showing an even number has turned up, then what is the probability that it is the face with 2 or 4 ?
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2022 | Series 65-6 | Set 1 | Question 14 |
| CBSE 2022 | Series 65-6 | Set 2 | Question 14 |
| CBSE 2022 | Series 65-6 | Set 3 | Question 14 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)