The median of the following observations : 11, 12, 14, 18, (x + 4), 30, 32, 35, 41 arranged in ascending order is 24. The value of x is :

1. 19

2. 20

3. 21

4. 21.5

If the mean of x - 3, x - 1, 7, x, 2x - 1 and 3x - 5 is 3.5, then the median is :

1. 2.5

2. 3.5

3. 3.8

4. 3.9

Case Study:
A school organized a Health Check Up Camp for its students. The weights (in kg) of the students of a class were recorded as below :

41, 40, 36, 52, 50, 48, 47, 45,
40, 41, 42, 49, 50, 51, 38, 41,
40, 45, 40, 39, 49, 51, 48, 46,
44, 50, 57, 38, 41, 51

Based on the above information, answer the following questions:

1. The range of the data is :
   (a) 20 kg
   (b) 21 kg
   (c) 22 kg
   (d) 23 kg

2. Mean weight of the data is :
   (a) 45 kg
   (b) 44.5 kg
   (c) 42.5 kg
   (d) 40.5 kg

3. Median of the data is :
   (a) 44 kg
   (b) 45 kg
   (c) 45.5 kg
   (d) 46 kg

4. One student weighing 45 kg, was absent on that day. Next day, the teacher added his name in the list. The average weight of the new group is :
   (a) 47 kg
   (b) 46.4 kg
   (c) 46 kg
   (d) 45 kg

5. The median weight of the students after adding the absentee in the list is :
   (a) 45 kg
   (b) 46 kg
   (c) 44.5 kg
   (d) 44.2 kg

Assertion (A) : The mean of 19 numbers is 38. If the mean of the first 10 numbers is 36 and that of the last 10 is 40, then the 10th number is 38.

Reason (R) : Mean = $\dfrac{\text{Sum of observations}}{\text{Number of observations}}$

1. A is true, R is false

2. A is false, R is true

3. Both A and R are true

4. Both A and R are false