Question: A set of test papers was machine scored. Later it was discovered that 2 points should be added to each score. Student A said, The

A set of test papers was machine scored.

Later it was discovered that 2 points should be added to each score. Student A said, “The mean score should also be increased by 2 points.” Student B added, “The standard deviation should also be increased by 2 points.”

Who is right? Justify your answer.

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