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

If the mean of the data x₁, x₂, x₃, ….., x_n is 'a', then the mean of the data x₁ + a, x₂ + a, …., x_n + a is :

1. a

2. 2a

3. $\dfrac{1}{2}$a

4. $\dfrac{a}{3}$

The average score of Raman in last 5 innings is 42. If he scored 38, 41, 43 and 47 in first 4 innings, then his score in the fifth innings was :

1. 31

2. 41

3. 51

4. 61

The mean of 25 observations was calculated to be 44. Later on it was found that two of the observations 34 and 46 were wrongly copied as 28 and 42. The correct mean will be :

1. 39.4

2. 40.4

3. 44.4

4. 43.9