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7. The nurses' union collects data on the hours worked by operating-room nurses at the Statsville General Hospital. Hours Per Week Number of Employees 12 32 35 38 42 a) Determine the mean, variance, and standard deviation for the nurses' hours. b) Determine the median, interquartile range, and semi-interquartile range. c) Illustrate these data using a box-and- whisker plot