The marketing team at an internet music site wants a better understanding of who their customers are. They send out a survey to 25 customers (and 21 32 35 29 31 use an incentive of $50 worth of downloads to guarantee a high response rate) asking for demographic information. One of the variables is 31 31 15 28 12 the customer's age. For the 25 customers, the ages are shown to the right. Complete parts a) through d). 38 23 43 47 25 25 22 32 36 33 36 42 42 43 47 a) Find the quartiles using technology. Q1 = and Q3 = b) Find the quartiles using the Tukey method. Q1 = and Q3 = c) Find the IQR using the quartiles from part b. IQR = d) Find the standard deviation. The standard deviation is. (Round to three decimal places as needed.) Next