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Average

The average o...

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

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B

52

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C

56

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D

55

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Solution

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 $8 = 70 \times 8 = 560$
$∴$ New average $= \frac{560}{10} = 56$

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