A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students. 38 23 33 28 18 38 28 18 38 8 28 18 8 3 18 Using this data set, compute the following. (a) median in hours per week hr/week (b) mean in hours per week hr/week (c) mode in hours per week hr/week (d) 40th percentile in hours per week hr/week (e) range in hours per week hr/week (f) sample variance (Round your answer to two decimal places.) (g) standard deviation in hours per week (Round your answer to two decimal places.) hr/week