Question

The average of 10 numbers is 7. What will be the new average if each of the numbers is multiplied by 8?

• A. 45
• B. 52
• C. 56
• D. 55
• E. None of the above

Answer 1

The correct option is C 56

The average of 10 numbers = 7
Total of 10 numbers = $10\times 7=70$
New total of 10 numbers after each of the given numbers is multiplied by $8=70\times 8=560$
$\therefore$ New average $=\frac{560}{10}=56$