A large set of test scores has mean 60 and standard deviation 18. If each score is
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A large set of test scores has mean 60 and standard deviation 18. If each score is doubled, and then 5 is subtracted from the result, the mean and standard deviation of the new scores are
(a) mean 115; std. dev. 31.
(d) mean 120; std. dev. 31.
(b) mean 115; std. dev. 36.
(e) mean 120; std. dev. 36.
(c) mean 120; std. dev. 6.
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