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

1. 14

2. 15

3. 16

4. 18

If the mean of first 8 prime numbers is :

1. 9.625

2. 8.625

3. 10.625

4. 12

Mean of 10 observations is 20 and that of other 15 observations is 16. Mean of all 25 observations will be :

1. 16.6

2. 18.6

3. 19.6

4. 17.6

The height of 8 students in a class are 102 cm, 107 cm, 82 cm, 103 cm, 97 cm, 111 cm, 88 cm, and 94 cm. The mean height is :

1. 94 cm

2. 95 cm

3. 97 cm

4. 98 cm