Q. The average of the marks of 12 students in a class is 36. If the marks of each student are doubled, find the new average?
a. 72
b. 45
c. 37
d. 79
Sum of the marks for the 12 students = 12 * 36 = 432. The marks of each student are doubled, the sum also will be doubled.
The new sum = 432 * 2 = 864. So, the new average = 864/12 = 72
