Marco enjoys playing hockey in his spare time. In his past 6 seasons, the number of goals he has scored each season is as follows: [18,16,21,16,15,24] (a) What is the mean? (Round answer to two decimal places.) Answer: (b) What is the median? (Provide exact answer.) Answer: (c) What is the mode? (Provide exact answer.) Answer: (d) What is the sample standard deviation? (Round answer to four decimal places.) Answer