For the following distribution :

The sum of lower limits of the median class and modal class is

1. 15

2. 25

3. 30

4. 35

The modal class of a given distribution always corresponds to the:

1. Interval with highest frequency

2. Interval with lowest frequency

3. The first interval

4. The last interval

The median of the following observations arranged in ascending order is 64. Find the value of x :

27, 31, 46, 52, x, x + 4, 71, 79, 85, 90

1. 60

2. 61

3. 62

4. 66

Assertion (A): Mean of the prime number lying between 5 and 20 is 13.4.

Reason (R): Mean = $\dfrac{\text{sum of all observations}}{\text{number of observations}}$

1. Assertion (A) is true, but Reason (R) is false.

2. Assertion (A) is false, but Reason (R) is true.

3. Both Assertion (A) and Reason (R) are correct, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are correct, and Reason (R) is incorrect reason for Assertion (A).