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IF the mean of a set of scores is 80 and standard deviation is 10, explain the effect on mean and standard deviation in case following changes are made to each of the scores

1) adding 5

2) multiplying by 5

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    (a) If you add $5$ marks to everybody, what will happen to the average mark? what will happen to the "wiggliness" of the marks?2012-12-07

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