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Suppose the random variable X has mean 45 and standard deviation of 15 and the random variable Y has mean 15 and standard deviation 3. What would be the mean and standard deviation of the random variable X + Y?

Mean 30, standard deviation 9

Mean 30, standard deviation 18

Mean 60, standard deviation 9

Mean 60, standard deviation 15.3

Mean 60, standard deviation 18

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