The teachers had marks for 50 students in his class. He computed their mean and standard deviation. Considering that the evaluation was too strict, he gave five grace marks to each student. This would
(a) Increase mean by five
(b) Alter standard deviation in an unpredicted way
(c) Change the rank order of the students
(d) Change the skewness of the distribution
Choose the correct option:
1
(a) only
2
(a) and (b) only
3
(a), (b) and (c) only
4
(a), (c) and (d) only