Question 1200119
**1. Calculate Total Berths:**

* **1A:** 1 coach * 18 berths/coach = 18 berths
* **2A:** 5 coaches * 48 berths/coach = 240 berths
* **3A:** 9 coaches * 64 berths/coach = 576 berths
* **Total Berths:** 18 + 240 + 576 = 834 berths

**2. Calculate Filled Berths:**

* **1A:** 10 berths
* **2A:** (1/2) * 240 berths = 120 berths
* **3A:** 275 berths
* **Total Filled Berths:** 10 + 120 + 275 = 405 berths

**3. Calculate Percentage of Berths Filled:**

* Percentage Filled = (Total Filled Berths / Total Berths) * 100
* Percentage Filled = (405 / 834) * 100 
* Percentage Filled ≈ 48.5%

**Therefore, the percentage of berths filled in the train on the given day is approximately 48.5%.**

**4. Calculate Unfilled Berths:**

* **Total Unfilled Berths:** Total Berths - Total Filled Berths = 834 - 405 = 429 berths

**5. Calculate Unfilled Berths in 3A:**

* **Unfilled 3A Berths:** Total 3A Berths - Filled 3A Berths = 576 - 275 = 301 berths

**6. Calculate Relative Frequency of Unfilled 3A Berths:**

* Relative Frequency of Unfilled 3A Berths = (Unfilled 3A Berths) / (Total Unfilled Berths)
* Relative Frequency of Unfilled 3A Berths = 301 / 429 
* Relative Frequency of Unfilled 3A Berths ≈ 0.7016 

**Therefore, the relative frequency of 3A berths among total unfilled berths in the train on the given day is approximately 0.7016.**