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An economics professor gives her students an exam the exam

An economics professor gives her students an exam. The exam scores have a mean of 75 and a standard deviation of 9. How would the value of the standard deviation change if the professor added 5 points to each students exam score?

it would stay the same
it would increase by 5
it would be multiplied by 5
it would increase by 25

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Basic Statistics: An economics professor gives her students an exam the exam

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