Given independent random variables X and Y with mean and standard deviations as shown,

	Mean	St. Dev.
X	9	2
Y	3	7

Find the mean and the standard deviation for each of the following variables: The mean of 3X is: and the standard deviation of 3X is: The mean of Y+6 is: and the standard deviation of Y+6 is: The mean of X+Y is: and the standard deviation of X+Y is: (Round answer to four places after the decimal.) The mean of X-Y is: and the standard deviation of X-Y is: (Round answer to four places after the decimal.) The mean of 3X-2Y is: and the standard deviation of 3X-2Y is: (Round answer to four places after the decimal.)