The marks obtained by 5 students are 21, 27, 19, 26, 32. Later on 5 grace marks are added to each student. What are the average marks of the revised marks of the students?
- A. 26
- B. 30 ✓
- C. 31
- D. 32
Correct Answer: B. 30
Explanation
The initial average is \frac{21+27+19+26+32}{5} = \frac{125}{5} = 25. If a constant amount is added to each observation, the mean increases by the same amount. The new average is 25 + 5 = 30.
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