The average monthly cost of prescription drugs for all senior citizens in a particular city is$520 with a standard deviation of $72. Let ¯ be the mean of such costs for a random sample of 25 senior...

The average monthly cost of prescription drugs for all senior citizens in a particular city is$520 with a standard deviation of $72. Let ¯ be the mean of such costs for a random sample of 25 senior citizens from this city. Find the mean and standard deviation of the sampling distribution of ¯.