Construct a frequency polygon from the following data :

The mean of the numbers : 7, 9, 4, 6, 5 is :

1. 5.8

2. 6.0

3. 6.2

4. 6.4

Following data have been arranged in the ascending order.

29, 32, 48, 50, x, x + 2, 72, 78, 84, 95.

If the median of the data is 63, the value of x is :

1. 31

2. 62

3. 124

4. 134

If the mean of 10, 12, 18, 13, 20 and 17 is :

1. 14

2. 15

3. 16

4. 18