Theory: If all the numbers in the set are increased/decreased by the same number(k) then the mean also gets increased/decreased by the same number(k)

The sum of the weekly salaries of 5 employees is $3,250 and Each of the 5 salaries is to increase by 10 percent
then even the average will get increased by 10%

Previous average = \(\frac{Sum}{5}\) = \(\frac{$3,250}{5}\) = $650

New average will increase by 10% of $650 = \(\frac{10}{100}\) * $650 = $65

So, answer will be E
Hope it helps!

To learn more about Statistics watch the following video

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