Question

The average of the marks of 14 students in a class is 66. If the marks of each student are doubled, find the new average?

• A. 66
• B. 14
• C. 132
• D. 28

Answer 1

Answer:

C. 132

The new average is 132.

There is a fundamental mathematical property for averages: If every observation/number in a data set is multiplied by a constant value, the average is also multiplied by that same constant value.

• Original Average: 66

• Operation: Each mark is doubled (multiplied by 2).

• New Average: $66 \times 2 = \mathbf{132}$