The average of the marks of 11 students in a class is 36. If the marks of each student are doubled, find the new average?
Choices:
A) 69 B) 70 C) 71 D) 72 E) 75

Rationale: sum of the marks for the 11 students = 11 * 36 = 396 . the marks of each student are doubled , the sum also will be doubled . the new sum = 396 * 2 = 792 . so , the new average = 792 / 11 = 72 . answer : d
Answer: D